When buying the pork leg, it is easier to prepare if you will ask the meat vendor to chop it for you about 1 1/2 inch thick. You can also use cook the whole pork pata.
Wash the pork pata in running water and soak in water for at least half an hour to remove the all the blood and to lessen the odor.
Wash and clean pata and drain. You can also soak in water for at least half an hour to remove the all the blood and to lessen the odor. Wipe with paper towel to dry. Remove hairs by burning it using a torch or lighter.
You can also burn the hairs using your stove by passing it through the flames.
This part, you have two options: retain the foot or trotters or cut it off.
Ask the butcher to cut it for you or you can use a cleaver to chop it off.
In a hot wok, heat at least a cup of cooking oil and sear the pork pata skin to remove odor and to have a nice reddish brown mahogany color when cooked.
In a pot combine soy sauce, pineapple juice, garlic, star anise and cinnamon bark.
Let boil and simmer for about an hour to 2 hours. Add more water if necessarily.
Then add sugar and oyster sauce. Boil again for 30 minutes or until the pork is tender.
Add in the mushroom and continue cooking until the skin is soft and with a gelatin texture and the liquid is reduced to half.
Mix cornstarch with 3 Tbsp water and pour in to thicken the sauce. Season with salt or fish sauce to taste.
In the meantime, wash and trim the bok choy. Blanch in a saucepan with boiling water for 2 minutes.
Then mix the bok choy with the pork hocks and serve hot.
You can make it more presentable by doing this: upon serving the pata tim, arrange a bed of blanched bok choy on a platter.
Then put the pork leg pieces and mushrooms on the bok choy and pour over the sauce on the pork pata.