Heat oil in a wok. You can use sesame oil for authentic flavor or use any vegetable oil.
Add minced ginger garlic, chili flakes and saute for few seconds.
Next add chopped onions and saute for 30 seconds.
Add the firm vegetables like carrot, beans, bok choy stems and saute for a minute.
Next comes peppers. Saute for another minute.
Now mix well, and saute for 4-5 minutes.
Next stir in the sauce- soy sauce, chili sauce, vinegar, maple syrup. Mix well.
Add salt and freshly cracked black peppercorn to taste. Now add the bok choy greens.
Saute in high heat for a minute.
Throw in the sesame seeds and mix.
Serve vegetable stir fry over a bed of steamed rice or noodles.