Crisp Mackerel Salad with Grainy Mustard Vinaigrette
Fatty cold-water fish, such as Atlantic mackerel (also called Boston mackerel), deliver the most important forms of omega-3 fatty acids, helping to reduce cholesterol and even stave off type 2 diabetes and some cancers. Avoid king mackerel, however, as it has high mercury levels. Here the fish is marinated in lemon juice, then broiled so the skin crisps.