In a nonreactive saucepan, combine the onions, a pinch of salt, and water to cover; bring to a boil, cook for 1 minute, and drain. Meanwhile, grind the oregano, black pepper, and cumin in a spice grinder or molcajete.
In the same pan, combine the vinegar, garlic, oregano, pepper, cumin, and onions. Add enough water to cover the onions and bring to a boil
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