INGREDIENTS
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Ingredients for four small or two large portions:
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4 tablespoons olive oil
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1 cup diced onion
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1 teaspoon salt, plus more to taste
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2 or 3 cloves crushed garlic
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a pinch of red pepper flakes (not in original recipe)
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1 can (28 oz) San Marzano tomatoes, blended smooth
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1/2 cup water to rinse out the can of tomatoes
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Small handful of basil leaves, left whole or sliced just before adding
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1 cup freshly grated Parmigiano-Reggiano (about 1.5 oz by weight), plus more to top
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4 tablespoons butter, cubed
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*8 ounces dry rigatoni