3 c. flour
1/2 c. cocoa
1 tsp. salt
2 c. sugar
2 tsp. baking soda
2 c. water
3/4 c. vegetable oil
2 tsp. vanilla
2 tbsp. vinegar

Combine flour, cocoa, salt, sugar, and soda in large mixing bowl. Add water, oil, vanilla, and vinegar. Beat 3 minutes at medium speed until thoroughly blended. Pour batter into a greased and floured 13 x 9 inch pan. Bake at 350 degrees for 35 to 40 minutes.