Try this Curried Eel (Aal i Karry) recipe.
Unlike standard fish stews that drown the protein in liquid, this preparation requires water to cover only half the fish. Restricting the volume concentrates the gelatin released from the skin and bones into a potent stock. Simmer the finger-length pieces until tender, usually requiring about 15 to 20 minutes depending on thickness, and maintain a gentle bubble rather than a violent rolling boil to prevent the delicate flesh from disintegrating entirely.
Building the sauce demands careful heat management when browning the large diced onion in butter. Sprinkle the curry powder directly into the hot fat alongside the flour for 60 seconds to release the fat-soluble aromatics before diluting with the reserved fish broth. Whisking vigorously prevents lumps from forming as the starch gelatinizes at approximately 200 degrees Fahrenheit, yielding a velvety medium-thick coating consistency.
Excessive boiling destroys the natural collagen structure of eel, turning firm meat into mush. Pour the hot curry sauce over the warm fish immediately after thickening, serving alongside steamed grains that absorb the excess sauce without thinning its flavor profile.