Cousin Johnnie's Red Velvet Whoopie Pie | Paula Deen

Ingredients

• 3 cups all purpose flour
• 1 teaspoon baking soda
• 2 teaspoons unsweetened cocoa powder
• 1½ cups Canola oil
• 1 teaspoon white vinegar
• 1 (1-oz) bottle red food coloring
• ½ teaspoon vanilla extract
• 1½ cups sugar
• 2 eggs
• 1 cup buttermilk
• 5 tablespoons All-purpose flour
• 1 cup milk
• 1 cup sugar
• 1 stick Butter, softened
• ½ cup solid vegetable shortening
• 1 teaspoon vanilla extract