In a large sauce pan over medium heat, cook and stir zucchini and lemon juice for 15 – 20 minutes or until zucchini is tender. Add the sugar, cinnamon and nutmeg: simmer 1 minute longer. Remove from heat and set aside.
For crust, combine the flour and sugar in a bowl; cut in butter until the mixture resembles coarse crumbs. Stir ½ cup into zucchini mixture. Press half of the remaining crust into a greased 15 x 10 x 1 baking pan ( 9 x 13 works well too ) . Spread zucchini over top; crumble remaining crust mixture over the zucchini. Sprinkle with cinnamon. Bake at 375 for 35 – 40 minutes or until golden and bubbly. Yield 16 – 20 servings.