Ingredients:

1 lb. russet potatoes - peeled and cut into 4 to 5 pieces each
1/3 lb. beef - thinly sliced 
2/3 lb. yellow onions - sliced (about 1/3 inch wide)
1 tablespoon vegetable oil
400 cc water (about 1 1/2 cups) 
3 tablespoons or more soy sauce (to taste)
3 tablespoons or more brown sugar (to taste)
2 tablespoons sake or white wine, 

Direction:
Prepare vegetables as described above. Heat a deep pan and add oil and beef. Sauté for a couple of minutes, then add onion and potato. Continue sautéing for 3 minutes. Add water, soy sauce, brown sugar, and sake or wine. Bring to a simmer half covered. Skim off any foam and cook for about 20 to 30 minutes until potatoes are done. 

*** For Details about Ingredients , check your nearest Japanese Store.