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1.
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Preheat the oven to 350 degrees F. In a medium pot heat 1 tablespoon of the oil over medium-high heat.
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Add the garlic and cook until fragrant, about 1 minute.
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Add the tomatoes with their juices, oregano, 3/4 teaspoon salt and 1/4 teaspoon pepper.
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Bring to a simmer and continue to cook until the tomatoes soften and the sauce thickens, 20 minutes, breaking up the tomatoes with a spoon as they soften.
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Reserve 2/3 cup of the sauce for assembling the lasagna and set the rest aside.
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2.
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Meanwhile, heat the remaining 1 tablespoon oil in a large skillet over medium-high heat and add the mushrooms.
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Cook until the mushrooms have released their liquid, 5 to 7 minutes.
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Add the sausage and continue to cook, breaking the sausage up with a spoon, until the sausage is browned and cooked through, another 10 minutes.
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Add the tomato sauce and stir to combine.
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3.
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Thinly slice about a quarter of the mozzarella and set aside; grate the rest on a box grater.
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Combine the grated cheese with the ricotta and the egg.
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Spread the reserved 2/3 cup tomato sauce in the bottom of a 9-by-13-inch baking dish.
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Top with 1 pasta sheet, a third of the ricotta mixture and a third of the meat sauce.
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Repeat with the remaining pasta, ricotta and meat sauce.
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Cover with foil and bake until the sauce is bubbling around the edges and the pasta is tender, about 45 minutes.
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Remove the foil, top with the sliced mozzarella and continue to bake until the cheese is melted, 15 minutes more.
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Let stand for 20 minutes and sprinkle with chopped parsley before serving with a green salad and some garlic bread.
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Cook's Note: You can assemble the lasagna up to 1 day before serving and refrigerate.
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You may need to add a few minutes to the baking time.
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Make it a Meal: Crudite with Infused Olive Oil and Balsamic, Truffled Pots de Creme