Ingredients :
2 cups all-purpose flour
1/3 cup softened butter
5 cups of blackberries or any other berries of your choice
3 cups divided sugar plus 1 tbsp
1 tablespoon of lemon juice (I used lemon this time because it was all my own and it was the same)
2 teaspoons baking powder
1 cup whole milk
2 tablespoons cornstarch