Vegan Lemon Cupcakes with Fresh Berry Filling and Lemon Buttercream

Name: Vegan Lemon Cupcakes with Fresh Berry Filling and Lemon Buttercream
Ingredients: 6 ounces vegan margarine, melted; 1 1/2 cups organic cane sugar; 6 tablespoons applesauce; 6 ounces soy milk; 2 tablespoons vanilla extract; 2 tablespoons fresh lemon zest; 2 1/4 cups organic, unbleached white flour; 1 tablespoon baking powder; 3/4 teaspoon salt; 1/2 cup chopped raspberries; 1/2 cup chopped strawberries; 2 tablespoons organic cane sugar; 1 tablespoon fresh lemon zest; 2/3 cup organic vegetable shortening; 1/3 cup vegan margarine; 4 cups powdered sugar; 3 to 4 tablespoons lemon zest