fry until brown. Drain the oil and set potatoes aside to drain on paper towels. 2. Fry the onion and garlic in oil, then add the beef and fry for about 1 minute or until meat is browned but not tough. 3. Mix the cornstarch, water, sugar and fish sauce in a small bowl, blending well. Add this to the beef and stir..add more water if needed to make a light not too thick sauce. 4. Fold in potatoes or...remove the potatoes to a serving dish then spoon beef and sauce over the potatoes. 5. If you like, sprinkle with lots of black pepper.