To Prep
Combine the lime juice, lemongrass, fish sauce, salad dressing, sugar, chilli and kaffir lime in a small bowl. Place in the fridge.
Soak noodles in warm water for 5 mins or until they are soft. Rinse under cold water and drain.
To Cook
Cook steak on a heated and oiled grill plate on medium-high heat. Cook steak for 3 mins each side or until cooked to your liking. Set aside to rest. Thinly slice the beef across the grain.
Combine the noodles, cucumber, coriander, mint, tomato, spring onion, basil leaves and bean sprouts in a large bowl.
Add the beef. Pour the salad mixture and toss to combine.
Divide noodles among serving bowls and top with roasted peanuts.