- 1 large Onion, sliced thick
- cilantro and Mexican oregano, dried, crumbled
- salt and pepper
- Bread slices, buttered
- vinegar and water, in equal amounts
- cayenne pepper, to taste
Put Onion slices in a bowl. Coat with spices, then cover with water and vinegar mixture. Refrigerate for 8 to 10 hours.
Drain Onion slices, season with salt, pepper and Cayenne. Place between two slices of buttered bread.