Cut tofu crosswise into eight slices. Arrange slices in one layer on a large plate or jelly-roll pan. Pour soy sauce over tofu; turn slices to coat and let stand for 1 hour.

Meanwhile, cut root ends off green onions. Cut off dark green portion of onions, leaving 3 inches of white and light green. Cut green onions in half lengthwise, forming 16 long strips. Set aside. Cut pea pods in half lengthwise. Set aside.

Pour oil into a large nonstick skillet. Preheat over medium-high heat. Stir-fry fresh ginger (if using) and garlic for 30 seconds. Add sweet pepper strips and stir-fry for 1 minute. Add green onions and pea pods; stir-fry for 2 to 3 minutes more or until crisp-tender.

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 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. Makes 4 (1/4 of the tofu slices and 1 cup vegetables) servings.