Fish In Horseradish Sauce

Ingredients

2 carrots
2 celery stalks
1 parsley root
1 onion
5 peppercorns
1 bay leaf
7 gr salt
1,400 ml water
425 gr fish fillet
45 gr butter
24 gr flour
180 gr horseradish
4 gr sugar
160 ml sour cream
2 eggs
180 ml horseradish sauce
1 flour until smooth

Instructions

shredded lettuce.