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1
Preheat the oven to 375u00b0F.
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2
In a large pot of salted boiling water, cook the pasta according to the package directions. Drain and set aside.
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3
In a large skillet, heat the oil over medium-high heat. Add the turkey, onions, ketchup, and garlic, and cook, stirring, until the turkey is fully cooked and the onions are lightly browned, 8 to 10 minutes. Add the spinach and cook, stirring, until wilted. Season with salt and pepper and remove from the heat. Set aside until ready for assembly.
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4
In a small bowl, combine the ricotta cheese, Parmesan cheese, egg, salt, 1 tablespoon of the Italian seasoning, and a pinch of salt. Stir together well.
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5
In the bottom of a 9 x 13-inch glass baking dish, spread 1/2 of the Marinara Sauce. Place 3 lasagna noodles over the sauce. Spread the turkey and spinach mixture even over the noodles. Pour a small amount of sauce on the top. Sprinkle with 2 cups of the mozzarella cheese. Add another layer of 3 lasagna noodles, and spread the ricotta mixture over them; sprinkle with 2 cups of the mozzarella cheese. Add the final layer of 3 lasagna noodles. Pour the remaining sauce on top and allow the sauce to seep through the layers. Sprinkle on the remaining 2 cups of mozzarella cheese and top with the remaining 1 tablespoon of Italian seasoning.
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6
Cover the baking dish with foil and bake for 20 minutes. Remove the foil and bake for 25 minutes more, until the cheese is bubbly and golden brown.
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7
In a large saucepan, heat the olive oil over medium-high heat. Add the onions, garlic, and oregano, and cook, stirring, until softened, 5 to 7 minutes. Add the basil and cook, stirring, until wilted, about 1 minute.
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8
Add the diced tomatoes, including the liquid in the can, and sugar. Remove from the heat and, using an immersion blender, blend until smooth. (You may also transfer the contents of the pan to a traditional blender to do this, but be careful because the sauce will be hot.) Return the sauce to the heat, bring to a boil, then reduce the heat, cover, and simmer for 10 minutes. Remove from the heat, add salt and pepper, and stir well.
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9
Serve the sauce immediately over gluten-free pasta or, once cooled, store in an airtight container. The sauce will keep in the refrigerator for up to 5 days. You can freeze the sauce for up to 3 months.
