Shoo-Fly Cake
["4 c. flour", "1 c. margarine, softened", "1 3/4 c. sugar", "1 c. molasses", "1 Tbsp. baking soda", "1 tsp. salt", "2 c. boiling water"]
["Mix first 3 ingredients to make crumb mixture; reserve 3/4 cup."]
["flour", "margarine", "sugar", "molasses", "baking soda", "salt", "boiling water"]