Wash the pig's leg or pata and rub the whole leg with salt. Set aside.
Heat oil in a cooking pot. And fry the pata until it gets light brown.
In another casserole, pour water then add the fried pata. Pour-in soy sauce, sesame oil, wine and star anise. Season it with peppercorn and cook for 10 minutes or until it boils.
When the sauce is a bit dry, add the mushroom and cook for another 5 minutes over low medium heat.
Then add-in the pechay or bok choy. Simmer for 3-5 minutes while stirring.`
Transfer into a serving plate and eat while hot! Enjoy.