I like to pickle them in lime juice with a sliced serrano. 3 parts lime juice, 1 part water, a touch of sugar and plenty of salt, no heating required. I prefer them after pickling at least an hour, even better overnight.I have not, but I like to quick pickle red onions to go with Mexican food. I slice the red onion thin, heat up cider vinegar and sugar with some water on the stove, pour the hot liquid over the sliced onion, and let it cool in the fridge. It makes a delicious topping for spicy food!






