1 Oso Sweet Onion, very thinly sliced and separated into rings
Place Oso Sweet Onion in a heatproof bowl. In a small saucepan, combine vinegar, oil, pepper flakes, and salt. Heat just until mixture reaches a boil. Immediately pour over onions, tossing to coat. When cool, stir in cilantro. Use at once, or refrigerate, covered, up to 3 days.
©Oso Sweet Onions