Boil about 1 cup of water and set aside to cool slightly. Carefully slice onions thinly with a knife or mandolin slicer. Set aside. Clean and dry a quart jar and set aside.
2-3 red onions
In a bowl or measuring cup, add in red wine vinegar, water, salt and sugar. Mix to dissolve the sugar and salt
1/2 cup red wine vinegar, 1/2 cup boiled water, 1 tablespoon sugar, 1/4 teaspoon salt
Place half of the sliced onions in the jar. Add in half of the peppercorns and half of the red pepper flakes. Add in the remainder of the onions, peppercorns and red pepper flakes. Pack in to reserve 1 inch of head space in the jar.
2 teaspoons peppercorns, 1/4 teaspoon red pepper flakes
Carefully pour the red wine vinegar mixture over the onions in the jar. Place the lid on the jar and tighten the band finger tight. Allow to cool on the counter. Ready to eat in about 30 minutes. Store in the refrigerator.
*Pro Tip* If you are trying to watch your sugar, substitute the sugar with honey or a low calorie, cup for cup sugar substitute.*If you wanted to prepare these to be shelf stable, check with your county extension office for water bath canning instructions.
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