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1–25 ounce jar (I got mine here.)
1 large red onion, peeled and sliced thinly
1 large fennel bulb, washed and sliced thinly
3/4 cup + white vinegar
1/2 cup water
1 tablespoon kosher salt
1 teaspoon white sugar
1 tablespoon black peppercorns
Pack the jar with the sliced onions and fennel tightly.
In a medium pot, add the vinegar, water, salt, sugar, and black peppercorns. Stir to dissolve while bringing to a simmer. Remove the mixture from the heat. Pour the mixture over the sliced onions and fennel in the jar. Let the mixture sit for 3 hours+. They will store in the refrigerator for two weeks.
Enjoy on street tacos, hamburgers, salads, pasta salad, or on top of mashed potatoes.