Wash salmon steaks, pat dry and sprinkle with 3 tablespoons of lemon juice. Salt the steaks and let them stand. Clean spinach and wash thoroughly. Peel and chop the onion and garlic and fry in 2 tablespoons of butter.
Add lightly drained spinach and allow to collapse. Season with salt, pepper and nutmeg and steam for about 5 minutes. Dab salmon steaks dry. Heat 2 tablespoons of fat in a steak pan.
Fry the fish in it from both sides for about 6 minutes. Season with salt and pepper. Heat 1/8 litre water. Stir in sauce powder and bring to the boil. Stir in 125 g butter in pieces. Season with remaining lemon juice.
Arrange spinach and steaks with some sauce on a plate. Garnish with lemon wedges. Remaining sauce extra is enough.