Using 8 metal or bamboo skewers, thread beef, onion, tomatoes and capsicum alternatively onto skewers. Brush skewers with oil and kecap manis, sprinkle with pepper and season with sea salt.
Pre-heat a char-grill pan or barbecue over medium-high heat and cook skewers for 8 to 10 minutes, turning often, or until lightly charred and cooked through.
Meanwhile, prepare noodles according to packet instructions. Drain and rinse under cold water. Prepare broad beans according to packet instructions. Drain and when cool enough to handle remove from shells.
In a screw-top jar place lime zest and juice, mirin and fish sauce. Shake well to combine. Place noodles, broad beans, cucumber and herbs in a large bowl. Drizzle with dressing and toss to coat.