M&S Marinated King Prawns with Dried Tomatoes & Basil Succulent Honduran king prawns and semi-dried tomatoes in a basil dressing. Great tossed through pasta. Ready to eat. 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.