Ingredients

• 5 cups fresh blueberries, rinsed
• 1 cup water
• 4 kumquats halved lengthwise, ends removed, and each half cut crosswise into 4 slices
• 1 1/2 cups sugar
• 2 limes, juiced
• 1 orange, juiced
• 2 tablespoons cornstarch
• 1 1/2 cups blackberries
• 1/4 teaspoon finely ground pepper, optional

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Instructions

1. Combine 2 cups blueberries, 1 cup water, kumquats, sugar and juices in a medium heavy-bottomed saucepan. Bring to simmer over medium-low heat.
2. In a small bowl, stir cornstarch and 2 tablespoons cold water until well combined. Slowly pour into the hot blueberry mixture and continue to simmer until thickened, 4 to 6 minutes.
3. Gently stir in remaining 3 cups blueberries and blackberries into thickened mixture and simmer gently over low heat for 3 minutes. If too thick, add up to 4 tablespoons cold water. Stir in pepper and remove from heat. Transfer to clean containers and store in the refrigerator for up to 2 weeks.