=&0=&=&1=& Crust:1 cup(s) sifted All-purpose flour? teaspoon salt? teaspoon baking powder1/3 cup(s) butter or shortening2-3 tablespoons cold waterApple Filling:8 small apples or 4 big ones2-3 tablespoons calamansi or lemon juice? cup(s) sugar1 teaspoon cinnamon3 tablespoons chopped walnuts2 tablespoon All-purpose flourGrated cheeseTopping:? cup(s) chilled butter? cup(s) All-purpose flour1 tablespoon chopped walnuts? cup(s) brown sugar # Prepare a 9-inch pie plate. Preheat oven to 375 F.# Sift floursalt and baking powder together.# Cut in butter into flour mixtures until pea sized.# Add as much water to bind the ingredients together.# Form into ball.# Roll out dough to 1/8 inches thick.# Fit dough into prepared pie plate.# Flute edges and chill for 10 minutes.# Prepare Apple Filling: Pare and slice apple thinly.# Put apple slice in a bowl and sprinkle with calamansi juice.# Combine with sugarcinnamon and nuts. Toss into the apple slices. If very juicy add flour.# Turn into prepared crust.# Top with grated cheese.# Prepare Topping: Cut in chilled butter into flour. Add Walnuts and brown sugar.# Sprinkle mixture on top of apple filling.# Bake for 30 to 40 minutes or until golden brown