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1
Bring a large pot of water to a boil. Cut a cross on bottom of each tomato. Remove pot from heat, plunge tomatoes in water, and let sit for 1 to 2 minutes, until skins loosen at cross mark. Spoon tomatoes into a colander and rinse with cold water.
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2
Skin and stem tomatoes; if really juicy, squeeze out some juice into sink. Crush pulp with your hands into a bowl, breaking it up into small chunks.
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3
Pour oil into a large frying pan and heat over medium heat. Add garlic if using, tomato pulp, and a big pinch of salt. Cook 1 to 2 minutes, until pulp breaks down and releases juices. Using a slotted spoon, put pulp back in bowl, leaving juice in pan.
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4
Simmer juice until thick enough to leave a mark when you scrape bottom of pan, 2 to 3 minutes. Check seasoning. If your tomatoes are not very tasty, add vinegar and a bit more salt, and chile flakes if you want a kick. Stir pulp and basil into sauce.
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5
Make ahead: 1 week, chilled.
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6
Note: Nutritional analysis is per serving.