Red onion two ways: lemon-dressed slices and vinegar-dressed small dice

Cut the red onion down the middle.

Small dice: make horizontal slices toward the core without cutting through, then slice vertically, then across into tiny cubes.

Thin slice: cut the core out of the other half so the slices fall apart, and slice following the shape of the onion to avoid thick stub ends.

Toss the slices in a bowl with lemon juice and salt; dress the small dice with red wine vinegar, salt and cracked black pepper.