In a mixing bowl; combine marinade ingredients.
Marinate beef 10-15 minutes.
In a small mixing bowl; combine sauce ingredients.
Taste for seasoning, adding more catsup as desired.
In a large skillet or wok; heat TB of oil.
Brown beef; remove from pan.
Add remaining TB of oil.
Saute onion, bell pepper and celery until crisp tender.
Add beef and tomatoes.
Cook 2 minutes.
Add green onion and sauce mixture; bring to a boil; stirring until slightly thickened.
Remove from heat.