- 2 large onions
Peel the onions and slice them into very thin slices.
- Separate the slices into rings.
- Place the onions in a bowl and cover them with ice cubes and water.
- Refrigerate for 2 hours.
- When you are ready to serve them, drain the Onion slices and rinse under cold water.
- Serve them in a glass bowl, drizzled with extra-virgin olive oil and red wine vinegar, and sprinkled with salt and freshly ground pepper.