Easter Lamb Cake & Whipped Cream Frosting

This is a family tradition cake for Easter in a lamb tin.  You can also make this a sheet cake.  This recipe has been used for years.  It's our family's favorite!

1 Cup Boiling Water, stove-top or microwave
2 Squares Unsweetened Chocolate
1/2 Cup Margarine, 1 Stick
1 3/4 Cups Brown Sugar
2 Eggs
1 3/4 Cups Flour, Unsifted, plus 2 tablespoons
1 Teaspoon Baking Soda
1/4 Teaspoon Salt
1/2 Cup Sour

 Whipped Cream Frosting:
4 Tablespoons Flour
1 Cup Milk, cold
1/2 Cup Margarine, 1 stick
1/2 Cup Crisco Shortening, solid butter or white
1 Cup Sugar
2 Teaspoons Vanilla, "pure" preferred

Cake:
Pour water over chocolate and let stand until cool, stirring once in a while to soften chocolate. Mix flour, baking soda, and salt together in a small bowl. Cream softened margarine (let stand for 2 hrs, but don't melt). Add brown sugar and blend well. Add the eggs, mix well and add sour cream. Add the pre-mixed flour mixture alternately with the chocolate water to the sour cream batter. Pour into a well-greased and floured lamb mold or 11x14 pan. Be careful not to overfill. Bake 325 degrees for 1 hour. Use toothpick in a hole to test cake. If toothpick comes out clean, it is done. Do not over-bake. Use remaining batter for cupcakes.

Whipped Topping:
Set your margarine and shortening in a medium size to large bowl for 2 hours to soften. Do not melt or soften in a microwave. Mix 4 T. flour with 1 cup cold milk in saucepan, then cook over a "low" flame (3-4 setting), stirring constantly the sides and bottom being careful to not burn, until a "thick" consistency. Immediately scrape into a small bowl and set on counter to Cool.

Cream the softened 1/2 cup (1 stick) margarine and 1/2 cup Crisco shortening (not liquid) for 4 minutes with an electric mixer. Add 1 cup sugar and beat for another 4 minutes. Be sure to stop and scrape sides. Then, add cooled four paste and beat an additional 4 minutes (4-5 mixer setting). Add 2 teaspoons pure vanilla and blend for 30 seconds, scrapping the sides of bowl. Refrigerate. Be sure cake is cool before frosting. Refrigerate. Delicious Cold.