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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.
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