Slice meat across the grain 1/4 inch thick and 6-8 inches long. Sprinkle with salt. Drizzle with water and let stand for 1 hr. Mix soy sauce, sugar, garlic, and oil. Marinate meat overnight. Lay meat slices on a rack over a baking pan. Dry the meat in hot sun for one day, turning occasionally. Brown meat over charcoal or fry in a pan to serve it hot. Also good cold.
If you don't want to do the sun-dry method, you can leave it in your oven at about 125 degrees, which will take about 8 hours.