Hamburger Pfannfisch

• steaks of haddock (or similar fish), 750 g (1½ lb)
• salt
• butter,

Clean the haddock and cut it into steaks or slices as thick as a finger. Rub these with salt and let them stand for an hour.

Lightly brown the onion in hot butter. Grease a reasonably deep, and heat-proof, casserole, with butter. Fill it with alternating layers of fish and potato. In between each layer put some of the onion and a sprinkling of pepper.

Combine the sour cream with