Salada de Cebola

Ingredients

 * 2 large onions

Directions
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.