Pork in sweet and sour sauce

1/2 kilo lean pork
1 large size onion, quartered 3 tomatoes, quartered 1 carrot (strips, 2" long)
2 bell pepper, red & green (strips) 2 stalks celery (1'/2" long)
3-4 cloves garlic, minced
1 small can pineapple tidbits 1 cup catsup
1 tbsp. soy sauce 1 tbsp. cornstarch 2 tbsp. flour 1 tbsp. salt 1 tsp. vetsin

Cut pork into small serving pieces. Boil in 11/2 cup water with a little salt. When tender, drain. Set aside broth to be used later. Sprinkle flour on pork. Fry until golden brown.
Saute' minced garlic until brown. Add altogether onion, tomatoes, celery, carrot, and pepper strips. Stir. After 3 minutes or until half-cooked, add catsup, pineapple tidbits (with syrup), and broth. Season with soy sauce and vetsin. Do not overcook the vegetables. Thicken with dissolved cornstarch. When it boils pour over fried pork.