Wet Bottom Shoo Fly Pie Makes two 9-inch pies. Crumb Mixture 2 1/2 cups all-purpose flour 1 teaspoon salt 1 teaspoon baking powder 1/2 cup shortening 1 cup brown sugar Bottom 1 cup hot water 1 cup brown sugar 1 cup molasses 1 teaspoon baking soda dissolved in 1 teaspoon vinegar Mix crumb mixture ingredients together. Blend bottom ingredients together. Line 2 pie pans evenly with liquid, and cover with crumbs. Bake at 425 degrees F for 15 minutes, and then at 350 degrees F until done.