INGREDIENTS
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12 ounces spaghetti, linguini or fettuccine *
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1 large onion, very thinly sliced, about 2 cups
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4 - 6 garlic cloves, very thinly sliced
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12 ounces or 3 cups grape tomatoes, halved
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10 basil leaves, torn in half
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2 tablespoons olive oil
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1/2 teaspoon red pepper flakes
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2 teaspoons kosher salt, plus more to taste
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1/4 teaspoon freshly cracked black pepper, plus more to taste
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4 1/2 cups water
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Topping: Freshly grated Pecorino Romano or Parmesan cheese, several basil leaves thinly sliced