Blackberry Fruit Filling for 4 Cups

Instructions:

1. Combine the blackberries, sugar, lemon juice, lemon zest, and salt in a medium heavy-bottomed saucepan, stirring gently to coat the berries.
2. Place the pan over medium heat and bring the mixture to a gentle simmer, stirring occasionally for 8–10 minutes until the liquid becomes syrupy.
3. In a small bowl, whisk together the cornstarch and cold water until a smooth slurry forms.
4. Slowly drizzle the slurry into the simmering berries while whisking constantly, cooking for another 2 minutes until the filling becomes clear and glossy.
5. Remove from heat and transfer the filling to a glass bowl. Let it cool to room temperature before refrigerating to reach final stability.