01 -
Take a big bowl, toss in those peppers and onions, and mix them all together until they look evenly combined.
02 -
Pour both vinegars into a mid-sized pot. Add in the sugar, mustard seeds, celery seeds, turmeric, salt, black pepper, and red pepper flakes if you'd like a little kick.
03 -
Put the pan on medium heat and let the mix warm up until it starts gently bubbling. Stir now and then so the sugar fully dissolves.
04 -
Carefully pour the hot vinegar mixture right over your onions and peppers in the bowl. Stir it all up to make sure the veggies are well coated.
05 -
After the mixture cools down completely, transfer it into clean jars or containers with lids that close tightly.
06 -
Pop the jars into the fridge and let the flavors meld together for about a day. It'll taste even better after sitting.