While strudel bakes, make apple roses if desired. Put juice from lemon with two cups of water in a microwave-safe bowl. Cut apple twice on either side of the core, then slice the two apple rounds as thinly as possible. Use your best knife or a mandolin. I used my Kyocera ceramic paring knife, which has kept its edge for years, almost as if it were enchanted. (If you haven’t created apple roses before, you may want to make a trial rose or two with three to eight slices before slicing the remaining apple.) Put apple slices in lemon water and microwave on high for three minutes. Let rest for five minutes. Slide a metal spatula underneath to loosen any sticking points and then transfer strudel to a serving plate.