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Pico de gallo (PEE-coe deh GUY-yoe) is a very chunky salsa with very watery liquid. It's not like most salsas, which have a thick liquid like slightly thinned out tomato paste. While a good portion of the chunks are diced onions, I have known people who won't have anything to do with onions who like pico de gallo! That's surprising. The flavor of this salsa does not seem like the flavor of onions. So just because you don't like onions, you might try a little pico de gallo, otherwise you might miss out on a unique experience.
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Many salsas are big on roasted tomatillos, the principal ingredient for green salsa, salsa verde. But pico de gallo doesn't include tomatillo.
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Other ingredients in pico de gallo include cilantro, diced Serrano chilli peppers, lime juice, diced tomatoes. Most people try to eat just the chunky part and reject the watery liquid, but I actually prefer the liquid, which is a quite flavorful, intense juice all of its own, probably loaded with Vitamin C. It does not taste like onions. It seems to be an ingredient for coctel camaron, which is not cheap stuff at $1 per ounce.