Fish Gratin With Button Mushrooms

• fish fillets2 lbs
• button mushrooms↗14 ounces
• shallots↗3
• butter↗1 1⁄2 tablespoons
• white wine↗1⁄2 - 3⁄4 cup
• butter↗

  for the dish

• oregano↗1 tablespoon
• salt and pepper
• cream↗1⁄2 cup
• egg yolks↗2
• shredded gruyere cheese2 tablespoons
• butter↗2 tablespoons

  flakes

Step-by-step instructions

1. 1

   Clean button mushrooms and slice. Mince the shallot. Braise both in butter for approximately 5 minutes. Deglaze with white wine, cook and reduce liquid slightly.

2. 2

   Butter a gratin dish. Mix half of the mushrooms with herbs and distribute on the bottom of the dish.

3. 3

   Add salt and pepper to the filets and place on top the mushrooms. Cover with the remaining mushrooms and bake in the 350°F oven for approximately 20 minutes.

4. 4

   Stir egg yolk into the cream. Remove the juice that formed while baking the fish and add it to the egg-cream mixture. Season with pepper and salt and pour over the fish filets. Sprinkle cheese over the dish and add a few flakes of butter.

5. 5

   Bake another 10 minutes at 350°F heat. Don’t let a brown crust form, if necessary cover with aluminum foil.

6. 6

   Serve with freshly peeled boiled potatoes, grainy rice or fine noodles.