In a sauté pan put about a tbsp. of evoo. Sauté the onion carrot, celery, garlic and mushrooms. Add the Townline BBQ sauce. Cool and then puree. On a sheet tray lined with plastic wrap, place some of the puree on the salmon and cover the whole salmon filet with the paste of veggies. Refrigerate for at least 2 hours or overnight. Roll out a piece of puff pastry. Carefully encase the puff pastry over the salmon. Close the seams and bake seam side down. Bake at 375° F for 30 minutes. Enjoy with chopped spinach and oven baked potatoes. Bon Appetit.