Gyudon Recipe ingredients 100g thinly sliced beef : 1/4 of a medium onion, thinly sliced. 1/2 cup (or water with 1/2 tsp dashi powder). Soy Sauce: 1 tbsp. Mirin: 1 tbsp (sweet rice wine). Sake: 1 tbsp (or dry white wine). Sugar: 1/2 tsp. Instructions Prep the Veggies: Thinly slice 1/4 of an onion into half-moons. Mix the Base: In a small pan, combine 1/2 cup dashi, 1 tbsp soy sauce, 1 tbsp mirin, 1 tbsp sake, and 1/2 tsp sugar. Boil the Sauce: Bring the liquid mixture to a boil over medium-high heat. Soften Onions: Add the onions to the pan, cover with a lid, and simmer for 3–5 minutes until they are soft. Cook the Beef: Add 100g of thinly sliced beef to the pan, spreading the pieces out so they cook evenly. Simmer Briefly: Simmer for just 2–3 minutes until the beef is no longer pink; avoid overcooking to keep it tender. Assemble: Pour the beef, onions, and all the savory sauce over a large bowl of steamed rice and serve immediately.