In a large heavy bottomed pan or dutch oven over high heat, heat your oil and brown your beef. Remove and set aside.Reduce heat to medium, add onions and cook until transparent.Add sake and boil off until the alcohol is gone (about 1-2 minutes), then add your mirin, soy, sugar, and dashi. Reduce to a low simmer.Add potatoes, carrots, kinyako, and previously cooked beef to the pan and simmer until potatoes and beef are tender (about 15 minutes).