Swiss chard

Halibut is a good source of heart-healthy omega-3s, as is salmon, which also works well in this recipe. The homemade pickled onions are easy, and great on sandwiches and bur­gers; they'll last a few weeks in the fridge. As for gremolata, it's an Italian condiment served with veal or fish; it gives a burst of flavour, bringing the mild taste of halibut to life.