INGREDIENTS
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2 tablespoons finely chopped white onion
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1 tablespoon minced fresh serrano or jalapeno chile, including seeds, or more to taste
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1/2 teaspoon kosher salt, or 1/4 teaspoon fine salt
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1/4 cup chopped cilantro, divided
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1 large or 2 small ripe Mexican Hass avocados, halved and pitted
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A squeeze of lime, if desired