Combine all sauce ingredients; whisk until smooth and set aside.
Add the peanut or canola oil to a large skillet or wok over high heat; add the sliced pork and cook, turning, until nicely browned and cooked through.
Remove the pork to a plate. Add the green onions to the skillet and cook, stirring, for 1 minute. Add the sauce mixture and cook for 1 minute longer. Add the pork back to the skillet and heat through.
Transfer the pork and sauce to a serving dish and garnish with reserved sliced green onion tops and sesame seeds, if desired.
Calories per serving: 434
Fat per serving: 19.5