INGREDIENTS
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Kosher salt
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3 tablespoons extra-virgin olive oil, plus more for greasing
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1/2 pound pancetta, trimmed of excess fat and diced
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1 medium onion, chopped
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1 fennel bulb, trimmed and thinly sliced
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1 28 -ounce can whole plum tomatoes
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1/2 cup heavy cream
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12 ounces penne
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1/2 cup chopped fresh basil
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1 cup grated parmesan cheese (about 2 1/2 ounces)
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2 cups grated mozzarella cheese (about 8 ounces)
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1 3/4 cups grated fontina cheese (about 6 ounces)