Place tomatoes in medium bowl. Add cilantro, garlic, onion, lime juice and salt. Taste a tiny bit of both serrano and jalapeño chiles to gauge degree of heat and add to taste. Stir to combine all ingredients, and let rest before serving to allow flavors to meld.
Per Serving:10 calories (0 from fat), 85mg sodium, 3g carbohydrates, (1 g dietary fiber, 1g sugar).
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