Preheat your broiler.
In a bowl mix together water, sugar, and salt then add to a large skillet.
Place fish filets in the skillet and bring to a boil over medium high heat.
Boil for 3 to 5 minutes depending on the thickness of the cod fillet.
Remove fish from water and place on lined pan.
Brush with melted butter and season with paprika.
Broil for about 7 minutes on low until fish flakes easily with a fork.
Brush with more butter and juice from 1/2 lemon and serve.