- 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
- Refrigerate for 8 to 10 hours.
- Drain onion slices, season with salt, pepper and cayenne. Place between
two slices of buttered bread.