If you're a fan of spicy food, you can give the classic gyudon a spicy twist by adding some heat to the dish. Here's how you can make a spicy gyudon: - 250 grams of thinly sliced beef - 2 medium-sized onions, thinly sliced - 3 tablespoons of soy sauce - 2 tablespoons of mirin - 2 tablespoons of sake - 1 tablespoon of sugar - 1 cup of dashi stock - 4 cups of cooked Japanese short-grain rice - 1 tablespoon of gochujang (Korean chili paste) - 1 teaspoon of chili flakes To make the spicy gyudon, follow these steps: 1. Prepare the beef and onions as mentioned in the classic gyudon recipe. 2. In a small bowl, mix together the soy sauce, mirin, sake, sugar, gochujang, and chili flakes. 3. Add the sauce mixture to the beef and onions in the pan and simmer for about 5 minutes. 4. Serve the spicy gyudon over a bowl of steamed rice and garnish with some chopped green onions. The spicy gyudon will add an extra kick to your meal and satisfy your craving for spicy flavors!