– 300 g or 9 oz fresh blackberries if using frozen berries, rinse and dry the berries (see related section in text above)
– 170 g or ¾ cup blackberry puree from above
– 170 g or heaped ¾ cup granulated sugar
– 3 large egg
– pinch fine sea salt omit if using salted butter
– 85 g or 6 tablespoons butter unsalted, cold