Stuffed Fillets Of Sole With Mushroom Sauce

• 240 ml dry wine (white)
• 350 ml cream (light)
• 120 ml fish liquid from baking dish to mushroom sauce
• 85 gr mushrooms (thin sliced fresh)
• 75 gr butter
• 30 gr onion (finely chopped)
• 10 gr flour
• 45 slices secon mushroom