Try other types of white fish, such as cod, halibut, or mahi-mahi.For a heartier, more flavorful twist, you could even use salmon.; If you use frozen fish, thaw it completely in the fridge ...

The pickled onions as well as the dressing can be made in advance, and the fish needs to marinate for only about 20 minutes, all of which makes this recipe especially weeknight-friendly.