Sweet & Sour Pork or Chicken

This is my dad's recipe for the Sweet and Sour Pork or Chicken that he used to make.

Cubed Pork or Chicken (leftover from Sunday dinner was common)
Onion, chopped into large pieces
Carrots, cut into large pieces
Peppers (green or red), cut into large pieces
Canned Pineapple

Sauce:

1 cup pineapple juice (add water, to get to 1 cup if necessary)
1 Tbsp cornstarch
3 Tbsp brown sugar (you can use white if you don't have brown)
3 Tbsp vinegar
1 tsp chicken granules (or chicken bouillon)
1 tsp soy sauce
Optional: Add garlic powder or minced fresh garlic

If uncooked, fry chicken or pork for 2 minutes. Add vegetables and fry about 4 minutes to soften. In a pint jar, shake up sauce ingredients. Add sauce to pan and stir while thickening. Add the pineapple and cook until warm. Serve over rice.