01 -
Preheat oven to 350°F. Butter and flour a 10-inch ceramic flan or quiche pan, or a large pie plate.
02 -
Combine flour, sugar, and salt in a large mixing bowl.
03 -
In a medium bowl, whisk together eggs, heavy cream, milk, vanilla, and liqueur until combined.
04 -
Gradually add the wet mixture to the dry ingredients, stirring until smooth and lump-free.
05 -
Pour the batter into the prepared pan. Scatter the blackberries evenly over the batter and dot the top with small pieces of butter.
06 -
Bake for 40 to 50 minutes, or until the custard is barely set and still slightly jiggly in the center. Allow to cool slightly as the residual heat will finish setting the dessert.
07 -
Serve warm, at room temperature, or chilled as desired.