Combine the beef with the sugar, half of the pepper, half of the garlic, 2/3 of the oyster sauce and light soy sauce, salt and cornstarch. Mix thoroughly and marinate for at least an hour in the fridge.
After marinating, remove the mixture from the fridge and let it get to room temperature.
Add the oil to a hot pan, and add the beef mixture. Stir fry until medium rare. Remove the mixture from the pan and deglaze the pan with the rice wine until reduced.
Add the remaining garlic fry until translucent. Add the beef again and add the remaining oyster sauce, light soy sauce, dark soy sauce and pepper.
Cook to your liking. We generally like ours medium rare if we're using the best quality beef.
The sauce should be thick.
Serve on a plate with thick slices of green tomatoes on the side.
Quarter the lime, put some of the ground Kampot black pepper and sea salt into a small side dish, squeeze the juice onto the pepper, combine, and taste. Add more salt or pepper, as you like.
Serve this dipping sauce (tek merec) on the side. Meat can be dipped into the bowl or it can be poured over the beef.