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1
Chop all ingredients by hand to a fine, even dice. Do not use a food processor or blender.
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2
Combine tomatoes, white onion, serrano chiles, and cilantro in a bowl.
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3
Add water a tablespoon at a time, stirring, until the salsa reaches a loose but not watery consistency.
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4
Season with salt, taste, and adjust.
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5
Serve at room temperature. Best eaten the same day it is made.