This Wellington will combine ingredients for different tastes. Mushroom, spinach,cheese, filet are perfect together.Cook your mushrooms with oil, garlic, thyme, and rosemary. Leave under marinate in the refrigerator for 2 hours. Then you can cook it.Caramelize the onions for Wellington. Drain spinach in the ice water. Make it dryby squeezing. Slice your blue cheese and leave into the fridge covered for some time.Sear the beef filets in olive oil and cool a little bit. Fold all the staff into the batter.The order is the following: spinach, blue cheese, onions, filet, a portion of portabellas, the rest of the spinach. You should spread each layer well. All panels of dough should be brushed with egg wash.Cook it for 20 minutes to 400°F. Then you’d reduce the heat to 350°F, later to the internal temperature is 110°F. Continue for 35 to 40 minutes. Cool for 10 min. Cut your Wellingtons in half and serve immediately.They look extravagance. They will be really huge portion of energy.