Christmas Tree Cake (Western Fudge Cake)

Christmas Tree Cake (Western Fudge Cake) Cake: 3/4 cup butter (room temperature) 2 cups sugar 1-1/2 tsp. Vanilla Flavoring 3 eggs 1/2 cup baking Cocoa 3 cups all-purpose flour 1-1/2 tsp. Baking Soda 3/4 tsp. Salt 1-1/2 cups ice water Icing: 3 Tbsp