In a blender, place ¾ of the bell pepper ( rough chopped), onion, 3 cups cucumber, garlic, tomato, jalapeño, and only 2 cups of the watermelon. Blend. Add herbs, spices, salt, vinegar. Blend to combine.
Optional: To deepen the red color, add a thin slice or two of fresh beet. Blend.
Add the rest of the watermelon and pulse a few times. Taste, adjust salt. Chill until very cold.
Serve in a bowl and top with a few or all of the optional garnishes. These really add good texture to the soup, so don’t skimp out on these!