The perfect summer graham cracker flax crust pie for your summer barbecues, festive for 4th of July and Canada Day.   Ingredients: Filling: 2 egg whites pinch of salt 1.5 cups plain Greek yogurt 1/2 tsp pure vanilla extract 1 Tbsp lemon juice 1 tsp lemon zest 1 Tbsp honey Crust: 1 1/4 cups graham…