OK this is going to sound a little out there but trust me I make every Xmas,its a huge hit. Take 2 fillets of a Kingfish of about 3-4 kg.Wash remove pin bones,pat dry lay flat.
Mix 500gms of sugar with 400 grams rocksalt + 1 tablespoon of ground black pepper. Rub/pat this mixture over flesh side of fillets,cover it well,Ive never used the whole mix,dont worry if you have leftover as long as fish is covered. THEN cover fillets with chopped fresh dill ,stalks & all. roughly chopped ,about 2 bunches,give or take. Then sprinkle with plain or lemon flavoured vodka.I SAID SPRINKLE!! Put 2 fillets flesh to flesh,wrap in cling film then al foil. Lay in tray,place flat board or similiar on top then heavy weights,I use left over fire bricks from wood fired oven project,or now neglected discs from barbells. Put in fridge,turn & drain after 12 hours,repeat for at least 2 days. When fish is opaque wash gently,pat dry. Cut as you would smoked salmon. Usually eaten with rye bread,capers,red onion & a mustard vinegret (olive oil,white wine vinegar,pinch white sugar,good german mustard). Its called gravlax its Swedish. Normally made with Tassie salmon/ocean trout obviously bought I started using Kingfish to give a contrast of red & white,never looked back. It only works with oily fish & fillets that arent to thick. It will keep a week in fridge