M&S 4 Battered Cod Fillets Frozen Four classic, perfectly crispy and golden battered cod fillets. Best served with chunky chips, mushy peas and tartare sauce. Oven cooks in 25 minutes. Serves 4. Our M&S seafood products have been sourced from fisheries and fish farms in a way that minimises their ethical and environment impact, while guaranteeing you the highest quality, delicious seafood you’d expect from M&S.