Chef's Market Blackberry Ketchup

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2 cups fresh or frozen blackberries

1/2 cup cider vinegar

1/2 cup water

3/4 cup brown sugar, firmly packed

1 teaspoon ground cinnamon

1/2 teaspoon ground cloves

1/2 teaspoon ground ginger

1/2 teaspoon salt

1/4 teaspoon cayenne pepper

2 tablespoons unsalted butter

1 tangerine, zest grated