INGREDIENTS
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3 tablespoons chopped onion
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1/2 teaspoon minced Serrano chili , or more, to taste
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1 1/2 teaspoons finely chopped cilantro leaves
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1/2 teaspoon salt , or more, to taste
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1 small vine-ripened tomato
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1 ripe Hass avocado
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Tortilla chips for serving