God dang this was gooood! You should try it. Pan fry firm tofu slices seasoned with soy sauce and black pepper. Set aside. Sauté sliced red onion and green peppers in olive oil until tender and onions are caramelized. Season with salt and pepper. Set aside. Sauté sliced mushrooms in olive oil, soy sauce and black pepper. Mix mushrooms with onion and peppers.
To assemble sandwich, cut up tofu into strips and fry in a hot pan until browned and then add some mushroom/onion/peppers. Heat through, and then place a slice of Daiya cheese on top then cover pan to melt the cheese. Slather some mayo on a French roll and transfer the melty mixture into your roll. Close up the sandwich and eat while it's still hot and gooey!