"This is a Mozambican specialty and one of the foods that changed my life in terms of African cuisine," says Duncan Welgemoed. "The best spot to get a prego roll in South Africa is the Radium Beerhall. It's run by my godfather, Manny, and is the oldest pub in Jo'burg. The meats are grilled out the back by Mozambican staff and are still done the same way today as they were 30 years ago." Start this recipe a day ahead to marinate the beef.
Note You only need two bread pockets to serve 4, but you can freeze the remainder for later use.