Salsa criolla (Peruvian pickled onions) is an essential accompaniment to all sorts of dishes, such as tamales, arroz con pollo, chicharrón, seco and papa rellena. Of course you don’t need to make Peruvian food to enjoy salsa criolla. You can pair it up with any rich and/or dish that is on the dry side and could use some a bit of juicy tangy zing. If you have time, prepare the onions several hours before using them. They keep well in the fridge for 3-5 days.