Preheat the oven to 200 °C. From the paper for baking, cut into pieces - 4 pieces length 25-30 cm, depending on the size of your fillet. On each paper put a piece of butter, 1 fillet, greens, salt-to pepper and put a slice of lemon.

All this style company to wrap up a very thick envelope in paper and put bake for about 20 minutes.

While fish is baking, prepare sauce. If the fish was intact, then take the remaining from profiling the skins, trim, etc. and cook for 10 minutes fish broth. In a saucepan pour the onions, pour the broth and wine, bring to a boil and continue to boil on high heat until the liquid is slightly thickened ( about 15 minutes ). Then add the cream, reduce the heat to medium, boil until thick, stirring occasionally. If the cream was not too thick, you can pour a couple of tablespoons of grated cheese. Sauce off and pour pot. Cover and let stand for 5 minutes. I added 2 teeth of garlic, but not necessarily.

Fish to get, deploy, remove the lemon and herbs.

Pour portion of sauce and serve with side dish or salad.