Preheat oven 400°
Cut squash in half horizontally and remove seeds. Pull or cut off stem if attached and on the other end, slice off a tiny sliver of the end so that it sits upright in the pan without rocking.
Place all squash have cut up in 9 by 13 glass baking dish.
Peel core and cut apples into 1-inch cubes and place in a large bowl. I
Immediately cover with lemon juice and toss to coat.
Add lemon zest, sugar, cinnamon, nutmeg, flour, salt, Sage and applesauce and mix.
Divide evenly between squash halves.
Cut butter into square pieces and press 1 press down into each filled squash half.
Pour water into the baking dish to come about 1/3 of the way up.
Cover pan with parchment paper or foil and bake 45 minutes. Check for doneness and bake for 15 minutes more if needed. Then uncover and bake for 15 minutes more to Brown tops.