Heat the oil in a large wok over a medium heat until the oil starts to shimmer. Add the garlic and dried chilli and stir quickly for a few seconds. Add the minced pork and stir-fry for 4–5 minutes until the meat has become golden.
Add the French beans and cook for 1 minute, then add the fish sauce, peanuts, measurement water, soy sauce and sugar and cook for 1 more minute. Spoon into the lettuce leaves and serve with some sweet chilli sauce on the side.