1-1/2 pound fillet of beef
2 tablespoon butter
1 small onion - cut in medium wedges
3/4 brown mushrooms - sliced
sea salt and freshly grated black pepper to taste
1/4-1/2 teaspoon nutmeg - ground
1/4 cup dry white wine
1 cup creme fraiche
Egg Pappardelle noodle - cooked al dente