1 lb. 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
ACTIVE TIME: 15 minutes
TOTAL TIME: 2 hours 15 minutes
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.
Pickled carrots can be stored in the fridge in a resealable container for up to 3 weeks.