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Heat the oil in a non-stick frying pan. Add the beef and fry until browned all over and starting to crisp. Add the spring onions, pepper, ginger, oyster sauce and beans. Stir-fry for another 5 mins until the veg has softened, then add the noodles and juice of 1 lime. Season well and toss everything together until well combined and heated through.
Separate the lettuces into leaves. Pile the noodles into the leaves, sprinkle over the reserved spring onions to garnish and serve with the lime wedges.