Blackberry Filling in 45 Minutes

Instructions:

1. Combine the blackberries, sugar, and salt in a medium saucepan over medium heat. Stir gently as the berries begin to release their juices. Simmer for 5–8 minutes until the fruit softens and the mixture becomes a bubbling, fragrant syrup.
2. In a small bowl, whisk the cornstarch and lemon juice together until a smooth, opaque slurry forms. Slowly pour the slurry into the simmering berries while whisking constantly. Continue to cook for 2–3 minutes until the filling transitions to a clear, mahogany-colored gloss.
3. Remove the pan from the heat. Stir in the chilled butter and lemon zest. Let the filling cool for 15 minutes before using.