Red velvet cake

Ingredients

• 1/2 cup shortening
• 1 1/2 cups white sugar
• 2 eggs
• 2 tablespoons cocoa
• 4 tablespoons red food coloring
• 1 teaspoon salt
• 1 teaspoon vanilla extract
• 1 cup buttermilk
• 2 1/2 cups sifted all-purpose flour
• 1 1/2 teaspoons baking soda
• 1 tablespoon distilled white vinegar
• 5 tablespoons all-purpose flour
• 1 cup milk
• 1 cup white sugar
• 1 cup butter
• 1 teaspoon vanilla extract