Add baking soda to boiling water; then add molasses and set mixture aside. Make a crumb mixture from flour, brown sugar and margarine, and reserve 1 cup of this. Mix together the remaining crumb mixture, liquid mixture and applesauce. Pour (batter is thin) into cupcake pan lined with cupcake papers, and sprinkle reserved crumb mixture on top of each cupcake. Bake at 350 degrees F. for 20-25 minutes. Yield: 2 dozen cupcakes.