Active Time

　　20 minutes

　　Total Time

　　45 minutes

Ingredients

　　4 medium peaches, about 1 1/2 pounds, peeled and cut into 1/2-inch-wide slices

　　3/4 cup sugar

　　1/2 cup cider vinegar

　　1/4 teaspoon hot red-pepper flakes

　　1 small red onion, halved lengthwise and sliced crosswise 1/8 inch thick (1 cup)

　　3/4 teaspoon salt

　　Combine peaches, sugar, vinegar, and hot pepper flakes, and briskly simmer, uncovered, until liquid thickens slightly, 15 to 20 minutes. Stir in onion and salt and simmer for 5 minutes. Relish will continue to thicken as it cools.

　　Cooks' note:

　　•Relish can be made 5 days ahead and chilled, covered. Bring to room temperature before serving.