"No canned tomatoes in sight...."
INGREDIENTS
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1 large yellow onion
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3 large cloves garlic
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1/4 cup plus 2 tablespoons extra-virgin olive oil, divided
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2 1/2 pounds roma or tomatoes on the vine
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1 teaspoon kosher salt
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Freshly ground black pepper
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10 large fresh basil leaves, plus more for serving