01 -
Take a large bowl and throw in those slices of peppers and onions. Stir everything around until it's mixed well.
02 -
In a saucepan, combine both kinds of vinegar with sugar, salt, turmeric, mustard seeds, celery seeds, black pepper, and the red pepper flakes if you'd like some spice.
03 -
Place the pan on medium heat and let things come to a gentle boil. Keep stirring now and then until all the sugar vanishes into the mix.
04 -
Pour that hot mixture right over your bowl of prepared veggies. Use a spoon to stir, making sure each piece is coated well with liquid.
05 -
Wait for your mixture to cool completely before scooping it into jars or storage containers with a snug lid.
06 -
Stick those jars in the fridge and leave them for at least a day. A little patience gives the flavors time to blend beautifully.