Follow these simple steps to bring your Japanese Beef Curry to life:

1. Heat Oil: In a large pot or Dutch oven, heat the vegetable oil over medium-high heat.
2. Sear the Beef: Add the beef cubes to the pot in batches, browning them on all sides. Remove and set aside.
3. Sauté Onions: In the same pot, add the chopped onions. Cook until they are translucent and slightly caramelized, about 5-7 minutes.
4. Add Carrots and Potatoes: Mix in the sliced carrots and diced potatoes, stirring to combine with the onions.
5. Combine Ingredients: Return the browned beef to the pot. Pour in the beef broth, and then add the curry powder, soy sauce, mirin, and sugar.
6. Season: Add salt and pepper to taste. Stir to ensure everything is combined well.
7. Bring to a Simmer: Increase the heat to high, allowing the mixture to come to a boil. Once boiling, reduce the heat to low, covering the pot.
8. Simmer: Let it simmer for about 60 minutes, or until the beef is tender and the flavors meld beautifully. Stir occasionally to prevent sticking.
9. Adjust Seasoning: Taste the curry before serving. Adjust seasoning if necessary, adding more salt, pepper, or curry powder to suit your taste.
10. Serve It Up: Serve the curry hot over a bed of cooked rice, garnished with pickled ginger and chopped green onions if desired.