Use green, Granny Smith apples for this recipe. Clean, peel, and core each apple. You'll want uniform slices, so that the apples are just about the same texture after they are baked/cooked. For regular-sized slices for an apple pie: Cut the cored apple into half. Then cut each half into four slices the long way, and each of those pieces will be cut into four. (This renders approximately 16 pieces per half, or 32 pieces per apple.)For smaller pieces to fill frittelle: You would double the apple-pie cuts. First cut the cored apple in half, continue with four slices from the half-apple, and then cut each of those 4 slices the long way to make 8. You will cut them into four cube-like pieces. (This renders approximately 32 pieces per half, or about 64 pieces per apple.) Place the cut apples into a gallon sized plastic bag, or reusable, sealable container.
Add the juice of a whole lemon, sugar, cinnamon, salt, and an all-purpose flour of your choice.
Seal your container and move the ingredients around to completely mix and cover the apples. All of the sugars should be dissolved and there will be liquid. Allow the apples to soak/marinate in the fridge for about an hour.
Strain most (for apple pie) or all of the juices (for frittelle) from the apples.