This Asian-style, grilled, vegan Portobello Mushroom Burger is full of delicious umami flavor! It’s slathered with Asian-style Guacamole, topped with a cool cucumber ribbon salad and crunchy carrot slaw. Healthy, delicious and really satisfying. AND totally vegan. Video!

This Asian-style, grilled, vegan portobello mushroom burger is full of delicious umami flavor! It's lathered with Asian-style Guacamole, topped with a cool cucumber ribbon salad and crunchy carrot slaw. Healthy, delicious and really satisfying. AND totally vegan! #veganburger #portobelloburger #veganportobelloburger #portobellomushroomrecipes #portobello #vegan #veganburger #grilled #grilledportobello

Oh my goodness, these Portobello Burgers are sooooooooo delicious!   A flavorful umami bomb! Portobello mushrooms are brushed with a Miso-Sesame-Sriracha marinade, then grilled until perfectly juicy and tender.

They are layered up with a Japanese-style cucumber ribbon salad, a carrot slaw (or Asian Slaw) and the best part,  as Asian style, avocado spread for the buns– seasoned with ginger & sesame, (aka Asian Guacamole).  Full of flavor… and totally vegan!

Miso Portobello Mushroom Burger | 60-Second Video

This Asian-style, grilled, vegan portobello mushroom burger is full of delicious umami flavor! It's lathered with Asian-style Guacamole, topped with a cool cucumber ribbon salad and crunchy carrot slaw. Healthy, delicious and really satisfying. AND totally vegan! #veganburger #portobelloburger #veganportobelloburger #portobellomushroomrecipes #portobello #vegan #veganburger #grilled #grilledportobello

 Portobello Burger Components:

  1. Marinated Portobello Mushrooms
  2. Asian Guacamole “the sauce”
  3. Cucumber Ribbons
  4. Crunchy Asian Carrot Slaw (or sub Asian Slaw)
  5. Buns (or try Sourdough Buns!)

A few components, but honestly doesn’t take too long to put this together.

How to make the Best Portobello Burgers!

Step 1:

Prep the portobellos!  Make the flavorful marinade. The umami flavored miso paste, blended with sriracha and sesame oil is delicious on portobello mushrooms!

This Asian-style, grilled, vegan portobello mushroom burger is full of delicious umami flavor! It's lathered with Asian-style Guacamole, topped with a cool cucumber ribbon salad and crunchy carrot slaw. Healthy, delicious and really satisfying. AND totally vegan! #veganburger #portobelloburger #veganportobelloburger #portobellomushroomrecipes #portobello #vegan #veganburger #grilled #grilledportobello

Step 2:

Make the cucumber ribbon salad!

This Asian-style, grilled, vegan portobello mushroom burger is full of delicious umami flavor! It's lathered with Asian-style Guacamole, topped with a cool cucumber ribbon salad and crunchy carrot slaw. Healthy, delicious and really satisfying. AND totally vegan! #veganburger #portobelloburger #veganportobelloburger #portobellomushroomrecipes #portobello #vegan #veganburger #grilled #grilledportobello

Cut baby cumbers into thin ribbons using a mandolin or veggie peeler. Or just cut them into thin disks, no problem! Season with the dressing!

Step 3:

Make the quick carrot slaw. I just used store-bought match stick carrots for this , but feel free to grate a carrot! You can also sub this Asian Slaw!

This Asian-style, grilled, vegan portobello mushroom burger is full of delicious umami flavor! It's lathered with Asian-style Guacamole, topped with a cool cucumber ribbon salad and crunchy carrot slaw. Healthy, delicious and really satisfying. AND totally vegan! #veganburger #portobelloburger #veganportobelloburger #portobellomushroomrecipes #portobello #vegan #veganburger #grilled #grilledportobello

Step 4:

Make the Ginger Sesame Avocado Spread…. or “Asian Guacamole”.

This Asian-style, grilled, vegan portobello mushroom burger is full of delicious umami flavor! It's lathered with Asian-style Guacamole, topped with a cool cucumber ribbon salad and crunchy carrot slaw. Healthy, delicious and really satisfying. AND totally vegan! #veganburger #portobelloburger #veganportobelloburger #portobellomushroomrecipes #portobello #vegan #veganburger #grilled #grilledportobello

Mash up a large avocado with fresh ginger, sesame oil and a splash of rice vinegar.

This Asian-style, grilled, vegan portobello mushroom burger is full of delicious umami flavor! It's lathered with Asian-style Guacamole, topped with a cool cucumber ribbon salad and crunchy carrot slaw. Healthy, delicious and really satisfying. AND totally vegan! #veganburger #portobelloburger #veganportobelloburger #portobellomushroomrecipes #portobello #vegan #veganburger #grilled #grilledportobello

Step 5:

Grill the portobello mushrooms for the burgers. I always start with tops down…they’ll dry out less.  Grill for 4-5 minutes over medium heat, giving them a nice sear,  flip and cook for a couple more minutes. If you are particular like me, collect the juice from the mushroom caps  before flipping and use that to baste the tops. Optional,  but keeps them moist. 😉

This Asian-style, grilled, vegan portobello mushroom burger is full of delicious umami flavor! It's lathered with Asian-style Guacamole, topped with a cool cucumber ribbon salad and crunchy carrot slaw. Healthy, delicious and really satisfying. AND totally vegan! #veganburger #portobelloburger #veganportobelloburger #portobellomushroomrecipes #portobello #vegan #veganburger #grilled #grilledportobello

Step 6:

Toast the buns! This is essential…..it keeps them from getting soggy!

This Asian-style, grilled, vegan portobello mushroom burger is full of delicious umami flavor! It's lathered with Asian-style Guacamole, topped with a cool cucumber ribbon salad and crunchy carrot slaw. Healthy, delicious and really satisfying. AND totally vegan! #veganburger #portobelloburger #veganportobelloburger #portobellomushroomrecipes #portobello #vegan #veganburger #grilled #grilledportobello

Step 7:

Assemble the Portobello Burgers!

This Asian-style, grilled, vegan portobello mushroom burger is full of delicious umami flavor! It's lathered with Asian-style Guacamole, topped with a cool cucumber ribbon salad and crunchy carrot slaw. Healthy, delicious and really satisfying. AND totally vegan! #veganburger #portobelloburger #veganportobelloburger #portobellomushroomrecipes #portobello #vegan #veganburger #grilled #grilledportobello

Spread the toasted buns lavishly with Avocado spread. This will keep the buns from getting soggy.

Top with the grilled portobello mushroom, gill- side up -to collect all the flavorful juices in the burger.

This Asian-style, grilled, vegan portobello mushroom burger is full of delicious umami flavor! It's lathered with Asian-style Guacamole, topped with a cool cucumber ribbon salad and crunchy carrot slaw. Healthy, delicious and really satisfying. AND totally vegan! #veganburger #portobelloburger #veganportobelloburger #portobellomushroomrecipes #portobello #vegan #veganburger #grilled #grilledportobello

Pile everything on top of the grilled portobello.

This Asian-style, grilled, vegan portobello mushroom burger is full of delicious umami flavor! It's lathered with Asian-style Guacamole, topped with a cool cucumber ribbon salad and crunchy carrot slaw. Healthy, delicious and really satisfying. AND totally vegan! #veganburger #portobelloburger #veganportobelloburger #portobellomushroomrecipes #portobello #vegan #veganburger #grilled #grilledportobello

Spread the bun tops with more avocado spread, and top the burger. Or, for a lower-carb option,  feel free to serve the portobello burgers, open-faced, with knife and fork.

This Asian-style, grilled, vegan portobello mushroom burger is full of delicious umami flavor! It's lathered with Asian-style Guacamole, topped with a cool cucumber ribbon salad and crunchy carrot slaw. Healthy, delicious and really satisfying. AND totally vegan! #veganburger #portobelloburger #veganportobelloburger #portobellomushroomrecipes #portobello #vegan #veganburger #grilled #grilledportobello

Other additions…..a squirt of sriracha and a little pickled ginger is nice.

This Asian-style, grilled, vegan portobello mushroom burger is full of delicious umami flavor! It's lathered with Asian-style Guacamole, topped with a cool cucumber ribbon salad and crunchy carrot slaw. Healthy, delicious and really satisfying. AND totally vegan! #veganburger #portobelloburger #veganportobelloburger #portobellomushroomrecipes #portobello #vegan #veganburger #grilled #grilledportobello

This is my favortie vegan portobello burger  and I can’t wait for you to try this and tell me what you think!

xoxo

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This Asian-style, grilled, vegan portobello mushroom burger is full of delicious umami flavor! It's lathered with Asian-style Guacamole, topped with a cool cucumber ribbon salad and crunchy carrot slaw. Healthy, delicious and really satisfying. AND totally vegan! #veganburger #portobelloburger #veganportobelloburger #portobellomushroomrecipes #portobello #vegan #veganburger #grilled #grilledportobello

Spicy Miso Portobello Mushroom Burger (Vegan)

  • Author: Sylvia Fountaine
  • Prep Time: 25
  • Cook Time: 10
  • Total Time: 35 minutes
  • Yield: 2 1x
  • Category: Vegan, main, sandwich
  • Method: grill
  • Cuisine: Japanese, Asian, american

Description

This Asian-style, grilled, vegan portobello mushroom burger is full of delicious umami flavor! It’s lathered with Asian-style Guacamole, topped with a cool cucumber ribbon salad and crunchy carrot slaw. Healthy, delicious and really satisfying. AND totally vegan!


Ingredients

Scale
  • 2 large portobello mushrooms
  • 1 Tablespoon Miso ( any color)
  • 1 tablespoon toasted sesame oil
  • 1 tablespoon sriracha
  • pinch of salt and pepper

Cucumber Ribbon Salad

  • 2 turkish cucumbers, cut length-wise into ribbons ( use a mandolin– see notes)
  • 1 scallion, sliced at diagonal
  • 1/4 teaspoon salt
  • ¼ teaspoon sugar
  • 2 teaspoons rice vinegar
  • ½ teaspoon toasted sesame seeds

Carrot Slaw ( to simplify this,  see notes)

  • 1 1/2 cups matchstick carrots ( or grated)
  • 1 scallion
  • 1/4 teaspoon salt
  • ¼ teaspoon sugar
  • 2 teaspoons rice vinegar
  • ½ teaspoon toasted sesame seeds

Asian Guacamole

2 whole wheat buns, grilled

Optional additions- pickled ginger


Instructions

Preheat the grill. Using a fork or mini whisk, mix the miso, sriracha, and sesame oil ….& pinch salt and pepper together in a small bowl to make a paste. Brush liberally onto both sides of the portobello mushrooms.

Using veggie peeler or mandolin, cut the cucumber into long thin ribbons. (You can always just slice them into very thin disks) Place them in a medium bowl along with scallions and add the dressing ingredients and gently toss.

Make the carrot slaw the same way. Place in a small bowl, toss with dressing ingredients. To save time you can combine both the carrots and cucumber (and double the dressing) and serve them together in one bowl – but I prefer them separate, just for “prettiness”, but it’s not essential. 🙂

Make the Asian Guacamole, by placing everything in a small bowl, mashing and stirring a bit until creamy and combined. It doesn’t have to be smooth. Sprinkle with sesame and chili flakes.

Grill the portobellos, top sides down first, for 4-5 minutes over medium heat, until juicy and tender. Flip, grill a few more minutes. Grill the Buns.

Assemble the burgers….spread buns with generous amount of Asian Guac, place the portobello- gills side up ( to catch all the flavorful juices) then mound with cucumber ribbon and carrot salad, a little squeeze of sriracha, optional pickled ginger. Use the remaining Asian Guac on the bun tops, and top the burgers.

Eat immediately.


Notes

For a lighter meal you could serve these open-faced, with knife and fork without the top bun.

To save time you can combine the both the carrots and cucumber (and double the dressing) and serve them together in one bowl – but I prefer them separate, just for “prettiness”, but it’s not essential. 🙂

Nutrition

  • Serving Size:
  • Calories: 415
  • Sugar: 12.7 g
  • Sodium: 701.6 mg
  • Fat: 21.2 g
  • Saturated Fat: 3.2 g
  • Carbohydrates: 48.1 g
  • Fiber: 12.9 g
  • Protein: 6 g
  • Cholesterol: 0.5 mg

Keywords: vegan burger, portobello burger, vegan portobello burger, grilled portobello burger

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Comments

    1. Shoot- sorry to hear that Nicole. It’s a pretty juicy one in general, I wonder if it could have been the bun itself?

  1. Fantastic! Another winner from Sylvia! Love the color, texture and the flavor is a surprise! We love it! Thanks Sylvia!

  2. This recipe was absolutely delicious! Super simple, very few ingredients, under 15 minutes. Amazing! Thank you so much.

  3. One of my favorite recipes on this blog and easily the best mushroom burger that I’ve had. The miso marinade is incredible! My husband and I look forward to making this every summer. I recommend doubling it and saving the left overs for bowls over rice.

  4. Soooo good! My husband and I love Portobello burgers and have never had one this good. The umami flavor of the mushroom pairs so well with the fresh veggies (especially when they’re straight from the garden). Right after the first bite we knew this recipe would be a “keeper”. Highly recommended!

  5. Ooh, this was so good- great range of flavors and textures unlike anything I’ve ever tasted. I used a slaw mix instead of carrots, but followed the recipe as is. A keeper for sure, and enjoyed by all, even the meat eaters.

  6. I’m a vegetarian but my family is not. I served this entire meal as our 4 th of July Barbecue- it was fabulous and no one missed the meat. I served it with the Asian slaw. For starters I made veggie spring rolls with peanut sauce to set the mood and of course drinks. Thanks for a wonderful meal!!!

  7. Bought soybean paste instead of miso by mistake…will that work? If so how much should I use…it seems extremely salty.

    1. Ahhhh! Shoot Mari! I’ve never tried it. Miso is salty too though. Maybe start with half, add more to taste?

  8. So delicious and so much flavor! I made these three days in a row. I can’t wait to try more of Sylvias recipes.

    1. How about something light like Asian Slaw, or baked sweet potato fries?

    2. You really don’t need a side with this recipe. However, I served it with speared cucumbers and extra guacamole for dipping. A red or yellow bell pepper and cherry tomatoes would be good for dipping also.

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Hi, I'm Sylvia!

Chef and author of the whole-foods recipe blog, Feasting at Home, Sylvia Fountaine is a former restaurant owner and caterer turned full-time food blogger. She currently lives in the Pacific Northwest and shares seasonal, healthy recipes along with tips and tricks from her home kitchen.

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