To make dressing, pound chillies, garlic, coriander roots and salt in a pestle and mortar to form a paste. Stir in remaining ingredients until combined.
Dry fry rice in a small frying pan over medium heat until golden brown and toasted. Cool. Grind to a fine powder in a pestle and mortar.
Cook noodles in boiling water according to packet instructions. Drain and transfer to a large bowl. Add half the dressing and roasted rice and toss to combine.
Brush steaks all over with oil and season. Heat a frying or griddle pan over medium-high heat. Cook steak for about 1-2 minutes on each side or until cooked to your liking. Transfer to a warm plate to rest for 5 minutes. Slice.
To make salad, place all ingredients in a large bowl. Add remaining dressing and ground roasted rice. Toss to combine.
Arrange noodles on serving plates and top with salad and sliced steak. Garnish with nuts, chilli and co-riander.