Mix the dressing ingredients together and set aside.
Oil and season the fillet steak. Heat a heavy based frying pan over a high heat and sear the steak for 3 minutes each side. Allow to rest for 5 minutes before thinly slicing with a sharp knife.
Cook the salad potatoes in a pan of salted water as per instructions. When the potatoes are just cooked(soft), toss the sugar snaps into the water for 30 seconds. Drain everything and wait for the potatoes to cool before slicing them into wedges.
Mix the beef, potatoes, sugar snaps, carrot, cucumber, spring onion, shallot, beansprouts and herbs. Stir through the dressing and toss.
Serve with chopped peanuts and lime wedges.