Fish4Ever Mackerel Fillet are wild-caught and preserved to maintain their natural goodness and high Omega-3 content, essential for heart and brain health.The star of this product is the delicious organic mustard sauce, carefully crafted with organic mustard seeds, organic vinegar, and often other organic flavourings to create a well-balanced taste that complements the oily richness of the mackerel. The sauce typically has a slightly sharp and tangy profile with the characteristic texture of wholegrain mustard, adding an extra layer of interest to the fish.