Fillet Of Steelhead Bonne Femme

• 6 peppercorns
• 2 egg yokes salt lemon juice (fresh)
• 1 bouquet garni
• 400 gr fillets of steelhead
• 240 ml hollandaise sauce
• 240 ml water
• 110 gr butter (cold)
• 80 gr mushrooms
• 60 ml milk
• 55 gr butter