Supplements are usually made with oil extracted from fatty fish, such as herring, mackerel, or tuna, which are particularly rich in omega-3 fatty acids (4). The American Heart Association (AHA ...
That's because, as the tuna sits in the oil in the can, the flavors of the fish infuse the oil with a salty, briny taste. There's no limit to how you slice or dice your onions for this trick ...