Jalapeño Pepper Jelly

Sterilize three ½-pint jars and their lids or similarly sized lidded storage containers.
In a food processor, combine the jalapeños and the bell pepper and process, scraping down the sides as needed, until the peppers are very finely chopped, 15 to 20 seconds. (They will let off quite a bit of liquid; this is okay.)
Transfer the contents of the food processor to a 4-quart stainless-steel or enameled Dutch oven. Add the sugar and vinegar and bring to a rolling boil over medium-high heat, stirring continuously. Boil, still stirring, for 3 minutes, then squeeze in the pectin. Return the mixture to a rolling boil, stirring continuously, and cook for 1 minute. Immediately remove from the heat and let rest until the foam has settled, about 1 minute. Skim off and discard any remaining foam.
Spoon the jelly into the sterilized jars and let cool for 1 hour. Seal the jars and refrigerate until chilled before using. The jelly will keep in the refrigerator for up to 3 months and up to 2 years if processed in a hot water bath and kept in a cool, dry place.