Vinegar Cake

Here's an old recipe I found
for baking a vinegar cake.

Ingredients:
1/2 cup shortening
2 cups brown sugar
1/4 cup cocoa
2 eggs
3 teaspoons vanilla
4 tablespoons vinegar,
fill cup with water
2 cups flour
1 teaspoon soda

Directions:
Cream shortening, add sugar gradually,
add cocoa and eggs well beaten.
Put vanilla in cup, add vinegar
and fill cup with water.
Sift flour and soda together twice,
add liquid and flour alternately.
Bake in large shallow pan.