INGREDIENTS
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4 teaspoons olive oil
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1 medium onion, coarsely chopped
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1 pound ground beef
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Salt and freshly ground black pepper
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14 (8-ounce package) manicotti
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1 (15-ounce) container whole-milk ricotta
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3 cups shredded mozzarella
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1 cup grated Parmesan
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2 tablespoons chopped fresh Italian parsley leaves
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2 garlic cloves, minced
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3 cups marinara sauce
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2 tablespoons butter, cut into pieces
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