Heat oil in a large Dutch oven over medium-high heat. Add 3/4 cup onions and next 6 ingredients (3/4 cup onions through anise); stir-fry 15 seconds. Add water, soy sauce, and sake; bring to a boil. Add potatoes. Reduce heat; simmer 25 minutes or until tender. Cool to room temperature. Remove potatoes from cooking liquid with a slotted spoon. Sprinkle with 2 tablespoons onions.