Drain tofu, reserving soy sauce. Stir reserved soy sauce and ground ginger (if using) into cooked vegetables; transfer vegetable mixture to a serving platter. Cover with foil and keep warm. Carefully dip tofu slices in cornmeal to lightly coat both sides. Cook in same skillet for 3 minutes on each side or until crisp and hot, using a spatula to turn carefully. (You may need to cook tofu slices in two batches; do not crowd skillet.) Serve tofu slices with vegetables. If desired, sprinkle with sesame seeds.