Tofu& Vegetable Stir

• 2 tomatoes chunked
• 1 clove garlic (minced)
• 1 onion chunked
• 1/2 block tofu
• 170 gr napa
• 120 ml water
• 65 gr pork (boneless lean)
• 60 ml kikkoman soyce sauce divided
• 30 ml vegetable oil divided
• 16 gr cornstarch divided