Devil's Food Cake

1 cup sour milk*
2 cups flour
2 cups sugar
2/3 cup cocoa
1/2 teaspoon salt
2 eggs
1 cup vegetable oil
1 teaspoon vanilla
1 cup boiling water
1 teaspoon baking soda
For sour milk, mix milk and vinegar/lemon juice in a small bowl. Set aside for 5 minutes.
In a large bowl, mix together all ingredients except the water and baking soda. Mix until batter is smooth. Add baking soda to the boiling water. Add water mixture to batter. Mix well. Batter will be thin. Pour batter into a greased and floured 9 x 13-inch pan and bake at 350 degrees for 35 to 45 minutes or until middle is set.

*1 cup milk + 2 teaspoons white vinegar or lemon juice