1. Cut off base of pak choi and separate the leaves then rinse and drain.
2. Heat the grape seed oil in a large pot over a high heat.
3. Add 1 tbsp sesame oil, garlic, chilli, fish sauce, soy sauce and pak choi. Toss until coated then quickly place a lid on.
4. Reduce the heat to medium and cook, tossing occasionally until the leaves have started to wilt. About 3 minutes.
5. Sprinkle with sesame seeds and serve immediately.