Cut the salmon in 4 equal pieces and place in a small hotel pan or baking dish. In a bowl, mix together mirin, water, sugar and salt, stir until dissolved. Add ginger and peppercorns to liquid. Pour brine on salmon and marinate for 1 hour. Pull salmon out of brine and place in a bamboo steamer. In a wok lined with foil add the rice, sugar and tea. Mix well and turn wok on medium heat. When mixture starts to smolder, place bamboo steamer on top. Seal the seam between the bamboo steamer and wok with wet cloths. Turn wok down to low and smoke for 15 minutes. Turn wok off and let smoke another 15 minutes. Salmon will be about medium rare and should be served warm.
Put a small mound of apple salad in the center of the plate, a potato cake on top and the salmon on top of the cake. Drizzle emulsion around the plate and garnish with chives.