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1
Tear rinsed pasilla chiles into small, irregular pieces.
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2
Slice jalapeños thinly on the diagonal; retain seeds.
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3
Draw a vegetable peeler along the length of the carrot to produce thin ribbons.
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4
Combine all ingredients in a nonreactive bowl (glass or ceramic). Toss with salt.
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5
Add vinegar a little at a time, tossing and tasting — the mixture should be moistened throughout but not pooling liquid.
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6
Allow to rest at room temperature for at least 1 hour before serving.
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7
Refrigerate in a covered jar; flavor improves over the following days and the relish keeps for a week or more.