Preheat the oven to 180°C, 160°C fan, Gas Mark 4. Mix together 1 tablespoon of the oil, Knorr Fish Stock Cube, lemon juice and lime juice. Rub into salmon fillets and leave for 15 minutes.
For the dressing, in a small bowl, combine the lemon zest, lime zest, soy sauce, mirin and sugar. Stir to dissolve and set aside.
Place the asparagus onto an oven tray and drizzle with remaining oil. Place the salmon on another baking tray.
Roast the asparagus for 10 minutes and the salmon for 12-15 minutes, until cooked.
Add spring onions and coriander to the dressing and drizzle over the salmon to serve. Sprinkle with some grated lemon zest if desired.