Mary Berry's Semolina Roast Potato Secret

The use of semolina for an extra-crisp coating on roast potatoes is a technique shared by several British culinary figures, including Nigella Lawson and Gordon Ramsay. Lawson credits the practice to her family's Italian au pair, Antonia, who invented the method when tasked with making a traditional British Sunday lunch. This personal family trick was published as early as 1998 in Lawson's book *How to Eat*. The science behind the crunch lies in semolina's coarse texture compared to finer all-purpose flour. This coarseness creates a gritty, larger surface area that promotes the Maillard reaction, the chemical process responsible for browning and crisping. The semolina granules also draw moisture from the surface of the parboiled potato, resulting in a drier exterior that fries to a harder, more durable crust in the hot fat. This method contrasts with more traditional approaches, such as that of fellow British cooking icon Delia Smith, whose widely followed recipe for perfect roast potatoes does not include a coating of flour or semolina. Smith's technique focuses on parboiling, shaking the potatoes to "chuff up" or roughen the edges, and roasting them in very hot animal fat like lard or beef dripping to achieve crispiness. Beyond the semolina, the choice of potato and fat are critical. Floury, high-starch potatoes like Maris Piper or King Edward are consistently recommended by chefs for their ability to produce a fluffy interior. While Mary Berry suggests a combination of goose fat and sunflower oil, goose fat on its own is a frequent choice for its high smoke point and rich flavor.