INGREDIENTS
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Tomato Sauce:
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3 tablespoons olive oil
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1 small yellow onion, finely chopped
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2 cloves garlic, crushed
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1 -- (28-ounce) can diced tomatoes, undrained
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1 -- (28-ounce) can crushed plum tomatoes, undrained
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1 tablespoon tomato paste
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1 teaspoon sugar
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1 teaspoon coarse salt
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1 tablespoon dried oregano
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1 tablespoon dried basil
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1/2 teaspoon crushed red pepper
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1/2 teaspoon coarsely ground black pepper
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Lasagna:
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2 1/2 cups whole-milk ricotta cheese
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2 (10-ounce) packages frozen spinach, thawed, drained and squeezed dry
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1 -- egg
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9 no-cook lasagna noodles
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1 pound part-skim mozzarella cheese, thinly sliced
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2/3 cup grated Parmigiano Reggiano cheese