Bring boiling-water canner, half-full with water, to simmer. Wash jars and screw bands in hot soapy water; rinse with warm water. Pour boiling water over flat lids in saucepan off the heat. Let stand in hot water until ready to use. Drain well before filling.
Place peppers in 6- or 8-qt. saucepot. Add vinegar and butter. Stir in sugar. Bring mixture to full rolling boil (a boil that doesn't stop bubbling when stirred) on high heat, stirring constantly.
Stir in pectin. Return to full rolling boil and boil exactly 1 min., stirring constantly. Remove from heat. Skim off any foam with metal spoon.
Ladle immediately into prepared jars, filling to within 1/4 inch of tops. Wipe jar rims and threads. Cover with two-piece lids. Screw bands tightly. Place jars on elevated rack in canner. Lower rack into canner. (Water must cover jars by 1 to 2 inches. Add boiling water, if necessary.) Cover; bring water to gentle boil. Process 10 min. Remove jars and place upright on towel to cool completely. After jars cool, check seals by pressing middles of lids with finger. (If lid springs back, lid is not sealed and refrigeration is necessary.)
For extra heat, do not discard all of the seeds from the jalapeno peppers.
Prepare using one of the following flavor options: Substitute serrano peppers for the jalapeno peppers OR substitute 1 Tbsp. crushed red pepper for the jalapeno pepper seeds OR substitute white vinegar for the cider vinegar.
Every once in a while, you may find that your jam does not set the way you expected. If your efforts resulted in a runny batch, try our Remake Directions to improve your finished jam. If your jam still doesn't set, you can always use it as a glaze or syrup.
Calories From Fat
% Daily Value*
Total Fat 0g
Saturated Fat 0g
Trans Fat 0g
Total Carbohydrates 12g
Dietary Fiber 0g
* Percent Daily Values are based on a 2,000 calorie diet.
Makes about 7 (1-cup) jars or 112 servings
* Nutrition information is estimated based on the ingredients and cooking instructions as described in each recipe and is intended to be used for informational purposes only. Please note that nutrition details may vary based on methods of preparation, origin and freshness of ingredients used.