- 1 pound carrots, peeled and sliced on the diagonal into 1/8-inch-thick coins
- 1 cup apple cider vinegar
- 1/4 cup sugar
- 2 tablespoons kosher salt
- 1 tablespoon black peppercorns
- 1 tablespoon mustard seeds
- Place carrots in a heatproof resealable container or jar. Combine vinegar, sugar, salt, peppercorns, mustard seeds, and 1/2 cup water in a small pot. Bring to a boil over high heat, stirring occasionally. Immediately pour over carrots. Let cool to room temperature, then cover and refrigerate at least 2 hours before serving.