1 1/2 cups all-purpose flour
1 tsp baking powder
1 tsp salt
1/2 cup shortening
1/2 cup milk
Stir together the flour, baking powder and salt. Cut in the shortening to form a crumb-like mixture. Blend in the milk to make a dough. Roll out on a floured surface to form a rectangle about 9 x 13-inches.
3 cups fresh blackberries, divided
2 cups water
1 stick butter
1 1/2 cups + 2 tbsp sugar
In a small bowl, crush 1/2 cup of the blackberries and set aside.
Melt the butter in a 9 x 13-inch baking pan.
Mix the remaining 2 1/2 cups blackberries with 1 1/2 cups of the sugar. Spread mixture over the dough and roll up jellyroll style rolling from the long side. Cut roll into 1-inch slices. Place slices over the butter in the baking pan. Pour the crushed berries/water mixture over the slices. Sprinkle the remaining 2 tablespoons of sugar over the top. Bake at 375 degrees for 45 minutes to 1 hour until lightly browned. Cool about 10 minutes before serving.