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In a large saucepan over medium heat, cook and stir zucchini and lemon juice until zucchini is tender, 15 to 20 minutes.
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Stir in 1 cup sugar, 1 teaspoon cinnamon and nutmeg and cook one minute more. Remove from heat and set aside.
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In a large bowl, combine flour and 2 cups sugar. Cut in butter with pastry blender or two knives until mixture resembles coarse crumbs.
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Stir 1/2 cup of butter mixture into zucchini mixture and mash the zucchini.
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Press half of remaining butter mixture into bottom of a cookie sheet.
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Spread zucchini mixture over top of crust, and sprinkle remaining butter mixture over zucchini.
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Sprinkle with 1 teaspoon cinnamon and sugar.
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Bake 35 to 40 minutes at 375, or until top is golden. Serve warm or cold.