Wash the jalapenos well. Cut off the stems and remove the seeds and insides if you want it less spicy.
Step 2
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Put the chopped jalapenos and 1 cup of cider vinegar into a blender. Add 1 tablespoon of pumpkin puree. Blend until smooth, stopping to scrape down the sides of the blender as needed.
Step 3
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Pour the jalapeno and pumpkin mixture into a big pot. Add the remaining 1 cup of cider vinegar and sugar. Heat it over high heat, stirring constantly until it reaches a rolling boil.