It works perfectly ... no-one (normal) has a salmon sized fish kettle, do they?
Place the fish on two large sheets of aluminum foil. Squeeze on some lemon juice and place the pats of butter on the salmon fillets. Seal the fillets well in the foil, and place the foil packet in the top wire basket of your electric dishwasher. DO NOT ADD SOAP OR DETERGENT. Close the dishwasher door, set the dishwasher on the hottest wash cycle, complete with drying cycle, and let it run through a full cycle. When the cycle is complete the fish will be cooked just right.
You can do stuff like Broccoli too ...