The Best Chocolate Cake Ever, Seriously

No, really- I love it. But it's not for the faint of heart. Very rich, very delicious! Give it a go and let me know what you think.

1 cube margarine
1/2 cup oil
4 Tbsp coca
1/2 tsp salt
1 cup water
2 cup flour
2 cup sugar
1 cup buttermilk (if you don't have buttermilk you can use regular milk and add 1 Tbsp lemon juice and let it sit for 5 min.)
1 tsp baking soda
2 eggs
1 tsp vanilla

Combine first five ingredients in a saucepan and bring to a boil. Remove from heat. Add the flour, sugar, and buttermilk. Then add the baking soda, eggs and vanilla. Mix well then pour into a greased 9 x 13 pan. Bake for 30 minutes at 350 degrees.

Icing:
1 cube butter, softened
4 cups powdered sugar
4 tbs milk
4 tbs coca
1 tsp vanilla

Mix and pour over warm cake. (you may need a little more milk- I did)