M&S Crispy Katsu King Prawns Taste of Asia by M&S Succulent king prawns coated in a crispy katsu flavoured crumb. Oven cooks in 10 minutes. Serves 2. 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.