Very Blueberry Cake

Ingredients

• 1/2 cup butter, softened
• 1/2 cup shortening
• 1 1/2 cups sugar
• 4 eggs
• 1 tsp vanilla
• 1 tsp almond extract
• 3 cups flour
• 1/2 tsp baking powder
• 1 TBSP flour
• 2 tsp cornstarch
• 1 tsp quick cooking tapioca
• 4 cups fresh or froze blueberries, divided
• 1 tsp grated lemon peel
• 1 cup powder sugar
• 1-2 TBSP milk
• 1 tsp lemon juice