Preheat oven at 375 F and line a baking sheet with parchment paper. Cut tofu into rectangles, 1 1/2 inches thick, remove execs liquid and marinate for 15 minutes in sesame oil, soy sauce, ginger and garlic.
Place cornstarch and sesame seeds in a shallow bowl. Dredge tofu slices in the mixture, covering each one well and shaking off the excess. Place tofu on the lined baking sheet and bake for 20 minutes turning once at the 10 minute mark. In a skillet with olive oil set at medium heat, sautè the mushrooms and zucchini for 2 to 3 minutes adding a dash of soy sauce at the end.
Once the tofu is ready, toast the buns on a grill pan and top each side with hummus. Add tofu, mushrooms, zucchini, onions and lettuce.