By far, the very best apple to use is Granny Smith. It is crisp and tart and the absolute best match for that super sweet caramel. Other good apple choices are Honey Crisp and Fuji.u003cbr/u003eu003cbr/u003eIn order to have that correct ratio of tart apple to sweet caramel, you should choose a small to medium-sized apple. None of those jumbo apples here, please. Make sure it is firm, without any holes or soft spots.