Green onions lend their color and flavor. Finally a raw egg is always served with sukiyaki. Now here's how the chefs prepare it. Then the vegetables are added, one by one, soaking up the flavors of the sauce. Finally when the vegetables are half-cooked, the meat is added and cooked to your liking.
Sugar is sprinkled over the meat, caramelizing in the hot pan along with the meat.
Sake is added next and brought to a boil. Then vegetables are placed in the pan, followed by the soy sauce and dashi or perhaps water. The mixture is brought to a boil until the vegetables are cooked. Same pan, same ingredients, same length of cooking time. But a different taste.