Whack the grill up to high and line a shallow baking dish with foil. Lay the salmon skin-side down in the dish, spoon over the soy and honey and sprinkle with togarashi seasoning.
Place under the grill to cook for 15 to 18 minutes until dark, sticky and the salmon flakes easily when prodded. Remove from the grill, squeeze over the lime juice, and set aside.
In a small dry frying pan, fry the sesame seeds over a medium heat until just toasted, then set aside.
To make the dressing, finely grate the lime zest into a large bowl, then squeeze in the juice from 1. Add the orange zest and juice, peel and grate in the ginger, then crush in the garlic. Whisk with the soy and oil until combined.
Shred and add the seaweed and spring onion and toss to coat. Roughly tear and toss through the lettuce.
Divide between plates, top with the flaked salmon and a scattering of toasted sesame seeds.
You can buy dried seaweed salad and wakame seaweed at japanesekitchen.co.uk. There is a range of seaweed available: why not experiment and find one you like?