Cook first 5 ingredients in a sauté pan until all the liquid is absorbed and mizxture resembles a paste. Season steaks with salt and pepper on both sides. Cover top of the steaks with the mushroom mixture. Cover the steaks with the puff pastry to form square like pockets. Seal the ends tightly and brush the top of the pastry dough with eggwash. Preheat oven to 425F. Bake wellington on a rack uncovered for 25 minutes. Serve immediately.

Serves 6