My family loves this recipe, and has said it's better than the usual apple pie recipes. My 3rd grade son requested I make it for his school's Thanksgiving feast. It calls for tart apples, but I've used Red Delicious, Fuji, pretty much whatever is on sale at the time. It also calls for "butter or margarine." I only use real butter, so I don't know what if any changes would occur if you use margarine.