INGREDIENTS

1 quart fresh blackberries
2 cups white sugar, or to taste
2 cups water
2 tablespoons butter
1 teaspoon cinnamon
2 cups flour
1 teaspoon salt
1/4 cup shortening
1 egg yolk
5 tablespoons milk

Place blackberries, sugar, water, butter, and cinnamon in a large saucepan. Cook and stir occasionally over medium heat until have started to break down and form a sauce, about 20 to 30 minutes.