Katherine’s Amazing Chocolate Cake
 1.  Grease and flour a 9 X 12 (24 X 30cm) cake pan.
 2.  Preheat the oven to 350F degrees (180C)
 3.  Sift:
      2-1/2 cups plain flour
      2 cups sugar
      6 tablespoons unsweetened cocoa powder
      2 teaspoons baking soda
      1 teaspoon salt
 4.  Pour over dry ingredients and mix well until smooth:
      1/2 cup cooking oil
      2 teaspoons vanilla
      2 tablespoons vinegar
      2 cups cold water
 5.  Pour in pan and bake at 350F (180C) for 35 minutes.
      The cake is ready when it bounces back to the touch
      or a toothpick comes out clean.