Lay each piece of salmon on a sheet of nori (on a bamboo mat) towards the bottom half. Season and lay down avocado slices and roll tightly like maki sushi. Place flour, egg and panko in 3 separate dishes. Roll sushi in flour, then egg, then panko and fry at 375 degrees F until golden brown, about 3 to 5 minutes. Meanwhile, in a blender, add the shallots, wasabi, soy and lemon juice and blend. Drizzle in the oil and toss with grilled maitakes. Check for seasoning.