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Heat oil in a large frying pan. When the pan is really hot, tip in the beef and pepper, then cook for a few mins until lightly browned and the beef is cooked through. Tip in the garlic, ginger and sesame seeds, then cook for 1-2 mins more, stirring often until they start to turn golden.
Pour over the soy sauce and 2 tbsp water, let it bubble down a bit until it starts to look syrupy, then drizzle with the sesame oil. Separate the leaves from the lettuces and arrange on a plate. Spoon a little of the beef mixture into each leaf, drizzle with pan juices and serve warm.