Combine the cranberries, agave syrup, jalapeño, lime zest and juice, and salt in a food processor.
Process until everything is finely chopped, stopping to scrape the sides once or twice, 30 to 60 seconds total.
Scrape into a bowl. Taste and add more agave syrup, if needed. Cover and chill until you're ready to serve. The relish is best if made at least 30 minutes before serving.
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Notes
Stir it--Give the relish a good stir before serving to reincorporate any juices that have settled at the bottom.
Storage--Leftover relish can be stored in an airtight container in the fridge for up to 5 days or frozen for up to 2 months.
Serving ideas--Serve extra relish alongside turkey quesadillas for an easy way to use up leftovers.
Dietary--This recipe is suitable for gluten-free, dairy-free, and vegan diets.