INGREDIENTS
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3 tablespoons extra-virgin olive oil
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3 ounces guanciale or pancetta, finely diced (see Note)
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1/2 medium onion, thinly sliced
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2 teaspoons minced anchovy fillet
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1 large garlic clove, minced
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One 14.5-ounce can crushed San Marzano tomatoes
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1 pound spaghetti
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1/2 cup torn basil leaves
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1 teaspoon crushed red pepper