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1
Drizzle the olive oil into a large pot over medium-high heat.
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2
Add the sausage, ground beef and pepperoni and stir, breaking the meat up as it begins to cook.
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3
Continue cooking, stirring occasionally, until brown, and then remove the meat to a plate.
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4
Add the mushrooms, garlic, bell peppers and onions to the pot and saute until the mushrooms have softened and the others have some color.
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5
Add the meat back in along with the tomatoes, tomato paste, pesto, half the parsley, 1 teaspoon of the salt, 1/2 teaspoon of the black pepper and the crushed red pepper flakes.
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6
Stir, reduce the heat to low and simmer for 25 to 30 minutes.
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7
Add the black olives and stir.
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8
Preheat the oven to 350 degrees F.
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9
To make the cheese mixture: Combine the ricotta and eggs in a large bowl.
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10
Add the Parmesan, the rest of the parsley and the remaining 1 teaspoon salt and 1/2 teaspoon pepper.
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11
Stir the mixture until totally combined.
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12
To assemble the lasagna: Overlap 4 lasagna noodles in the bottom of a large rectangular baking dish.
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13
Spoon half the cheese mixture over the noodles and smooth it out into a flat layer.
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14
Lay half of the mozzarella slices on top followed by half of the meat sauce.
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15
Repeat these layers once more and top with some extra Parmesan.
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16
Bake until heated through and bubbly on the top, 40 to 45 minutes.