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Preheat oven to 450 degrees F. Line your baking sheet with foil and brush the foil with a little oil.
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Slice eggplant and toss it in salt and 1 T. oil. Place your eggplant slices on your prepared baking sheet. Roast eggplant slices in your oven for 15 minutes. When done, the tops of the eggplant slices will look dry and you will be able to easily pierce the slices with the tines of a fork. Remove the tray of eggplant slices from the oven and, wearing heat-proof gloves, fold the sides of the foil up and over the eggplant to make a sealed packet. Let the packet of eggplant slices sit for 15 minutes; this will permit your eggplant to cook a bit more.
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Reduce heat in your oven to 375 degrees F.
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Oil a gratin dish. Prepare Israeli couscous by putting it in a large heated saucepan over medium-high heat. Toast the couscous until it just begins to take on come brown color and it is aromatic. Quickly, add two quarts of water and salt to taste. Boil for 10 minutes. The couscous pasta should be al dente but not mushy when it is ready and there will still be plenty of water in your pan when the couscous is cooked. Drain the couscous and rinse with cool water. Return the drained couscous to the cooking pot, cover it with a dishtowel and the pot lid and let it sit for 10 minutes.
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Put prepared couscous in a large bowl and add 1/2 cup of the tomato sauce. Spoon the couscous and tomato sauce mixture into your prepared gratin dish to make a layer.
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Boil water and briefly immerse spinach in the water. Drain spinach, being sure to squeeze out as much water as possible once the spinach has cooked. Spread a thin layer of the spinach over the couscous. Sprinkle crumbled feta or ricotta on top of the spinach layer.
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Arrange cooked eggplant slices on top of the spinach/couscous/cheese layer. Spoon the remaining tomato sauce over the eggplant and drizzle with the remaining olive oil. Sprinkle with grated Parmesan and grated mozzarella. Sprinkle a scattering of chiffonade sliced fresh basil leaves.
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Bake in preheated oven for 30 minutes. The dish should be browned and bubbling when it is finished. Let the dish sit on your counter for 15 minutes before serving.