Onions pickled with exceptional spices such as cinnamon and cloves can best be described as tangy, a bit sweet, and crunchy all at the same time.
Begin by toasting aromatics over heat. Keep them moving so they become fragrant but do not burn.
To the fragrant spices, add apple cider vinegar, lime juice, sugar, and some salt if desired.
Add thinly sliced onion to a jar with a tight fitting lid. Add the cinnamon stick and the liquid.