Prepare the noodles following packet directions. Combine the lime juice, fish sauce, palm sugar, lemongrass, kaffir lime and chilli in a small bowl.

Heat a barbecue grill or chargrill on medium-high. Brush the beef with a little of the lime juice mixture. Cook on grill for 3 minutes each side for medium or until cooked to your liking. Transfer to a plate. Set aside to rest.

Combine the noodles, cucumber, tomato, mint, coriander, apel, edamame, mint, and spring onion in a bowl. Thinly slice the beef across the grain. Add the beef to the noodle mixture. Pour over the remaining lime juice mixture. Toss to combine.