Salmon en Croute

Name: Salmon en Croute
Cook time: 20 min
Total time: 20 min
Cuisine: French
Ingredients: 75g butter or block margarine; 110g plain flour; A pinch of salt; Cold water to mix; 450g piece of salmon fillet, skinned and any bones remove, cut into 4 even sized steaks (or 4 skinless and boneless salmon fillets weighing approximately 110g each); 10g butter (a heaped teaspoon); 140g packet watercress, rocket and spinach salad (any larger stalks removed); 1 rounded tablespoon crème fraîche; 1 dessertspoon lemon juice; Whole nutmeg, freshly grated; Salt and freshly milled black pepper