Canned, or tinned fish is an excellent choice to include. Because it is already cooked it is easy to prepare and can be added to almost any dish. Canned tuna, salmon, sardines, mackerel, and anchovies contain heart-healthy omega-3 fatty acids, vitamin D, selenium, and B vitamins.  Both water-packed and oil-packed varieties are good choices and there are many flavored options as well which can help reduce the amount of dressing or sauces that you need to add.