Heat a large fry pan over high heat. Oil the steak and season with salt and pepper, coat in the ground coriander.
Cook the steak for 3-4 minutes on each side or more if you prefer your steak medium to well done.
Set aside to cool. Slice into 1cm slices.
Combine all dressing ingredients together. Place vermicelli in a bowl with the mint, basil and chilli and sliced beef. Add half of the dressing and combine gently.
Place in serving bowls and spoon over the remaining dressing.