1. Slice salmon into 1cm strips. Thinly slice spring onion.
2. Combine miso, mirin (Japanese sweet rice wine), light soy sauce, lemon juice and sesame oil. Mix until smooth with no lumps.
3. Place salmon and spring onions in a bowl. Pour on dressing and mix evenly.
4. Keep marinated for 2 hours in fridge.
5. Sprinkle with sesame seeds and serve