Preheat a chargrill or barbecue on high heat. Brush the beef fillet with olive oil, season with salt and pepper, and grill for 10 minutes, turning occasionally, for rare or until cooked to your preference.
In a large mixing bowl, add lime juice, sesame oil, brown sugar, fish sauce, soy sauce, grated ginger, and chopped garlic. Combine well.
In the same bowl, combine red onion, cucumber, capsicum, cherry tomatoes, coriander, mint, basil, and chopped red chilli.
Cover loosely with foil and let the beef rest for 5 minutes before slicing thinly.
Soak rice vermicelli noodles in a bowl of boiling water for 5 minutes until softened. Add them to the mixing bowl with the Thai basil, mint, and coriander. Combine well.
Add the beef and toss to combine. Serve immediately in individual plates.