Chocolate Oil Cake
["1 c. oil", "1 c. sour milk*", "1 egg", "2 c. flour", "2 c. sugar", "3 tsp. soda", "1/2 tsp. salt", "1/2 c. cocoa", "1 c. boiling water", "1 tsp. vanilla"]
["*To make sour milk, add 1/4 c. vinegar to milk.", "Mix all ingredients together, except add water last, and pour into mixture slowly.", "Beat well each time.", "Add vanilla last.", "Bake 45 minutes at 350\u00b0.", "Do not open oven door first 20 minutes."]
["oil", "sour milk", "egg", "flour", "sugar", "soda", "salt", "cocoa", "boiling water", "vanilla"]