Combine strawberries, blackberries, sugar, cornstarch, orange juice, sea salt, vanilla extract, and freshly cracked black pepper in a large saurcepan over medium low heat. Bring to a simmer, stirring occasionally, for about 10 minutes or until the berries have broken down a bit but still have some shape to them. Remove pan from heat and allow to fully cool.
2 cups fresh strawberries, 4 cups blackberries, 5 tablespoons granulated sugar, 3 tablespoons cornstarch, 1 tablespoon fresh orange juice, ¼ teaspoon sea salt, ½ teaspoon vanilla extract, ½ teaspoon freshly cracked black pepper