Wacky Cake ⋆ Dairy-free, Egg-free chocolate cake

Ingredients

• 1-1/2 cups all-purpose flour
• 1 cup granulated sugar
• 3 tablespoons cocoa
• 1 teaspoon baking soda
• 1/2 teaspoon salt
• 6 tablespoons vegetable oil or melted shortening
• 1 tablespoon vinegar
• 1 teaspoon vanilla
• 1 cup cold water
• 3 tablespoons butter or margarine, softened
• 1 cup sifted powdered sugar
• 3 tablespoons unsweetened cocoa powder
• 1 teaspoon vanilla extract
• chopped nuts (optional)