Soak the mushrooms in a little hot water, then quarter them and save the soaking water. Boil 2 cups fresh water and add the cauliflower. Boil until pieces are tender and drain. Tofu can be deep fried or cut into bite sized pieces and stir-fried with the rest of the ingredients. Heat the frying pan at high heat and add oil. Add tofu, cauliflower, carrots, mushrooms and their soaking liquid, tamari, and yeast. Stir-fry for 5 minutes. Garnish with coriander, black pepper and salt with rice noodles.