With gloved hands, cut away stems from peppers. Slice into 1/4-inch slices.
In a large pot, add apple cider vinegar, white sugar, garlic powder, turmeric, and celery seed. Bring mixture to a boil. Reduce heat and simmer for 5 minutes.
Raise the heat to bring the mixture back to a boil. Once boiling, add the pepper slices. Allow to return to a boil, then reduce the heat again and simmer for 4 minutes.
To Can
Transfer the peppers using a slotted spoon to sterilized glass canning jars, leaving 1/4-inch of headspace.
With just the syrup in the pot, increase the heat to bring it to a full rolling boil. Boil syrup for about 6 minutes.
Ladle the syrup into the jars with the jalapeno slices. To remove air pockets, use a skewer to disturb jalepeños. Check the headspace again to ensure 1/4-inch headspace is maintained.
Wipe the rims of the glass jars with a clean and damp paper towel. Top with a canning lid and screw on the ring to finger tight.
Process in a water bath canner for 10 minutes.
Once the processing time is complete, turn off the heat and remove the lid. Wait 5 minutes before removing from the water bath canner. Let sealed jars set for at least 12 hours before disturbing.
Notes
Be sure to put on gloves before cutting your jalapeños!These taste best after they have been set for 1 month. If you are NOT canning these and storing them in your refrigerator, they should be used within 3 months.