"Let the pressure cooker do all the work for you...."
INGREDIENTS
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1 small yellow onion
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3 cloves garlic
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10 ounces dried lasagna noodles (about 11)
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2 tablespoons olive oil
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1 1/2 pounds lean ground beef
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2 tablespoons tomato paste
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1 tablespoon dried Italian seasoning
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1/2 to 1 teaspoon red pepper flakes
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2 teaspoons kosher salt, divided
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1/2 teaspoon freshly ground black pepper, divided
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1 (24 to 25-ounce) jar marinara sauce
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3 cups water, divided
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1 cup whole-milk ricotta cheese
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1/2 cup grated Parmesan cheese
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4 ounces part-skim mozzarella cheese
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2 tablespoons fresh parsley leaves