How to slice the onion: Slice the ends off the onions. Stand onion on the cut side and slice in half. place the halved onion cut side down and slice into 1/8-1/4 inch slices, slicing with the grain.
Refrigerate: Store in refrigerator for 5 days in a sealed container.
Freeze: For easy access freeze in small portions. An ice cube tray works well for this.