Instructions:
In a large jar, combine the finely chopped onions, roughly chopped hot peppers, packed light brown sugar, celery seed, ground mustard, ground turmeric, ground black pepper, and kosher salt.
Stir the ingredients in the jar to ensure they are well combined.
Pour the white or apple cider vinegar over the mixture in the jar.
Cover the jar tightly and refrigerate for at least 1 day to allow the flavors to meld. The chutney is best after a few days.