Saute steak with garlic on medium heat until steak is cooked through. Remove steak from pan. Saute tomatoes and onion until tender. Return steak to pan. Mix shoyu, sugar, cornstarch, lemon juice, and water until smooth. Add to pan and simmer until glossy.
Serve with rice.
Note: May replace tomatoes with broccoli, Chinese peas, snap peas or other vegetables.