Cut the beef into 1-inch cubes. Lightly season them with salt and pepper on one side, then set aside for seasoning to settle.
In a bowl, combine the soy sauce, oyster sauce, Worcestershire sauce (or Knorr/Maggi liquid seasoning), sugar, and paprika. Mix and set it aside.
Heat 2 tablespoons of olive oil in a skillet or wok over medium heat. Fry the garlic, stirring it often, until it turns light golden brown. Be careful not to overcook or burn the garlic, as it can become bitter. Once the garlic is just right, take it out and set it aside.
Using the same skillet or wok with the residual garlic-infused oil, increase the heat to high. Add 2 tablespoons of butter and swirl it around until it melts completely.
Toss the beef cubes into the pan, being careful not to pack them too tightly—this might mean cooking in batches to avoid steaming them instead of searing. Let the beef sear untouched for about 2 minutes, then give them a flip and sear the other sides for another 2 minutes to get them nicely browned all over.
If you've seared the meat in batches, now's the time to get all the pieces back into the pan.
Pour the prepared sauce over the meat. Let the sauce come to a gentle simmer, then mix them well to make sure the beef is evenly coated. Season with ground black pepper to taste.
Stir in half of the fried garlic. Transfer to a serving dish once the beef is cooked to your desired doneness.
Top your Beef Salpicao with fried garlic slices and chopped chives or scallions.