In a bowl, combine pork and the marinade ingredients: garlic, oyster sauce, Worcestershire sauce, peppercorns, sugar and paprika. Mix with hand and gently squeeze so the meat will absorb the marinade. Let is stand for 2 hours or more.
In a pan or wok, heat abut 3 tablespoons of cooking oil and saute the chopped garlic. Saute until it turns brown. Remove from the oil and set aside.
In the same pan having the garlic infused oil, stir fry the pork for about 10 to 15 minutes or until brown. If the meat looks too dry, add a few teaspoons of water.
Then add the butter and continue sauteing for another 2 minutes. Add salt if desired.
Transfer into a serving dish and garnish with fried garlic. Serve with fried rice or steamed rice.