Delicius Grilled Mackerel Fillets in Extra Virgin Olive Oil and chilli. The chilli enhanced the intense flavour bringing all the flavour and nutritional properties of the best hand-processed grilled mackerel fillets to your table, offering you all the taste of one of the most-loved dishes from the sea's kitchen. The mackerel fillets, cleaned and trimmed so that only the heart of the product remains, are arranged in the packs and then grilled. The electrically-heated plates are placed on the fillets and the combined effect of the heat and slight pressure grills them delicately, avoiding any scorching which could give the product an unpleasant, bitter aftertaste.