1. Pound the beef to a 1cm thickness. Cut into long, wide slices and place in a bowl with the marinade. Stir to combine, cover and set aside for 30 minutes.
2. Preheat a chargrill or barbecue to moderately hot. Thread the beef onto skewers.
3. Grill the beef skewers for 1-2 minutes on each side or until cooked to your liking.
4. Mix the salad ingredients with the dressing and place on a large plattter. Top with the beef skewers and serve. Alternatively, try serving beef skewers with the salad in individual bowls or noodle boxes.
To make the marinade:
Finely chop the lemongrass and garlic and pound in a mortar and pestle until it becomes a coarse paste. Add the fish sauce, pepper and sugar and stir to combine. If using lemongrass paste, add it to the crushed garlic, fish sauce, pepper and sugar and combine.
To make the dressing:
Stir the ingredients together and set aside.