Remove stems from all the peppers. Cut half of the peppers in half and remove the seeds by scraping them out with a small spoon. Place the peppers into a food processor and pulse 7 to 8 times to roughly chop peppers.
Transfer jalapenos to a large pot and add the vinegar. Bring mixture to a boil then lower to a simmer for about 20 minutes.
Add sugar to the pepper mixture and bring to a boil. When it reaches a rolling boil, allow to continue boiling for 1 minute. Add butter to keep the mixture from foaming. Add liquid pectin and stir to mix. Allow mixture to boil for 3 minutes and remove from heat.
Ladle mixture into sterile jars leaving 1/4 inch headspace. Place hot lids on the jars and screw rims firmly. Proceed canning in a hot water bath for 10 minutes. Refrigerate after opening.
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