
In a wok or wide skillet over medium heat, heat oil. Add onions, garlic, and ginger. Cook until softened.
Add ground pork and cook, breaking into pieces with the back of a spoon, until lightly browned. Drain excess oil as needed.
Season with soy sauce and oyster sauce.
Pour in water and bring to a simmer. Cover and cook until the pork is tender and the sauce is slightly reduced.
Increase heat to high. Add carrots and cook briefly, then add the green beans.
Season with salt and pepper to taste.
Continue cooking for a few more minutes until the vegetables are tender-crisp.