Instructions: Bring the water and the 1 1/2 tbsp vinegar to boil. Add the onion. Return to a boil, then simmer, uncovered, for 2 to 3 minutes. Drain the onion and let it cool. Stir the onion, 1 1/2 tsp vinegar, oil, seeds, and salt together.

Refrigerate if not using right away, but allow the onions to come to room temp before serving.

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