Core and pare apples and slice into generously-buttered 9x13-inch Pyrex dish.
Squeeze lemon juice over apples, and sprinkle generously with cinnamon.
Mix sugar and flour and shake evenly over the apples. Slice the stick of butter into as many pieces as you need to cover the sugar/flour combination. Bake in a 350° F oven for 1 hour.Servings: