Preheat pan over medium-high heat. Melt the butter.
Toss in onions and garlic. Saute for a minute.
Add the pork. Cook for 20 minutes or until the liquid evaporates. Make sure to not dry it out.
Add the green beans. Cover and cook for 5 minutes.
Remove cover. Add broccoli, red bell pepper, and teriyaki sauce. Mix very well. Cover and cook for another 5 minutes.
Uncover. Stir and remove from the heat. Serve warm or hot over rice or noodles.