Brown Rice with Tofu, Broccoli, and Water Chestnuts

3 tablespoons gluten free soy sauce
1 tablespoon rice vinegar
1 teaspoon sugar
1 (14-ounce) package water-packed extra-firm tofu, drained and cut into 1-inch cubes
5 cups small broccoli florets
1 1/2 cups (1/4-inch) diagonally sliced carrot
1/2 cup peeled, chopped broccoli stems
1 1/2 cups sliced green onions
1 tablespoon grated peeled fresh ginger
2 garlic cloves, minced
1 cup snow peas, trimmed
1 (14-ounce) can whole baby corn, drained
1 (8-ounce) can sliced water chestnuts, drained
1/2 cup vegetable broth
1 tablespoon cornstarch
1/2 teaspoon salt (optional)
4 cups hot cooked brown rice

Combine first 4 ingredients, tossing to coat; cover and marinate in refrigerator 1 hour. Drain in a colander over a bowl, reserving marinade. Cook broccoli florets, carrot, and broccoli stems in boiling water 1 1/2 minutes; drain. Plunge into ice water. Drain.

Heat a wok or large nonstick skillet over medium-high heat, and spray with cooking spray. Add tofu; stir-fry 5 minutes or until lightly browned on all sides. Stir in onions, ginger, and garlic; stir-fry 30 seconds. Stir in broccoli mixture, snow peas, corn, and water chestnuts; stir-fry 1 minute. Combine broth and cornstarch, stirring with a whisk. Add cornstarch mixture, reserved marinade, and salt to pan; bring to a boil. Cook 2 1/2 minutes or until slightly thick, stirring constantly. Serve over rice.