M&S 21 Day Matured Sirloin SteakM&S Food has been at the heart of the nation since 1884. Giving our customers their best-loved products at the incredible quality and value that only M&S can deliver. From Percy Pig to the freshest M&S Select Farms produce, we grow, source, and develop our own products to give you family-ready food that's unbeatable on flavour and innovation. And that's whether you come to us for your family favourites, an indulgent treat, or your perfect party food spread. After all, this is not just food… This is M&S Food.Tender, British beef sirloin steak, matured for 21 days for succulence. Lightly oil, season and pan-fry for four to nine minutes.