Mix the first 4 ingredients. Mince white parts of green onions; thinly slice green parts.
Cut tofu into ½-in. cubes; pat dry with paper towels. Toss tofu with cornstarch. In a large skillet, heat 4 tablespoons oil over medium-high heat. Add tofu; cook until crisp and golden brown, 5-7 minutes, stirring occasionally. Remove from pan; drain on paper towels.
In same pan, heat 1 tablespoon oil over medium-high heat. Add peas; stir-fry until crisp-tender, 2-3 minutes. Remove from pan.
In same pan, heat remaining 1 tablespoon oil over medium-high heat. Add pepper; cook 30 seconds. Add garlic, ginger and minced green onions; stir-fry for 30-45 seconds. Stir in soy sauce mixture; cook and stir until slightly thickened. Remove from heat; stir in tofu and peas. Sprinkle with sliced green onions.
