Chocolate Buttermilk Sheet Cake - cooking recipe

Ingredients

2 c. plain flour
2 c. sugar
1/2 tsp. salt
1 stick margarine
1/2 c. cooking oil
1 c. water
3 Tbsp. cocoa
2 eggs, beaten
1/2 c. buttermilk
1 tsp. soda
1 tsp. vanilla

Preparation

Note:
To
make buttermilk, add 1/2 teaspoon vinegar in 1/2 cup milk.