3 cup flour
2 tsp. baking soda
1 tsp. salt
2 cup sugar
6 Tbsp. cocao (heaping Tbsp., is best)
2 Tbsp. vinegar
10 Tbsp. margarine, melted
1 tsp. vanilla
2 cup cold water

Mix dry ingredients together in a large bowl. Add vinegar, margarine, vanilla and cold water. Mix well at medium speed (or stir vigorously with a whisk) until blended. Pour into an ungreased (I usually at least wave some non-stick spray over the pan) 9 x 13 inch pan. Bake at 350 degrees F for 30-35 minutes, until cake springs back.