Yoshinoya, Sukiya, Matsuya - Japan's gyudon chains sell hundreds of millions of bowls every year because gyudon is fast, cheap and genuinely satisfying. The home version is better: you control the quality of the beef, the richness of the sauce, and the consistency of the egg if you serve it with one. Fifteen minutes of cooking, around £2-3 per serving depending on the beef cut, and a macro profile that works well as a protein-forward weeknight dinner.
On the beef: The key is thin slices. Most supermarkets do not sell beef pre-sliced for gyudon, but a few techniques work: freeze a steak for 30-40 minutes until firm and slice with a very sharp knife, or ask a butcher to slice it thin on a machine. Shabu-shabu beef found at Asian grocery shops is the correct cut and usually the easiest option.
Combine dashi, soy sauce, mirin, sake and sugar in a wide pan. Bring to a simmer. Add the onion and cook over medium heat for 5-6 minutes until soft and translucent.
Separate the beef slices and add to the pan. Stir gently and cook for 2-3 minutes until just cooked through. Do not overcook - thin beef continues cooking in residual heat. The sauce should have reduced slightly and clung to the meat and onion.
Divide rice between bowls. Spoon the beef and onion over the rice, ladle a little extra sauce over the top. Serve with a small pile of pickled ginger on the side.
Optional but strongly recommended: a soft-poached or slow-cooked egg (onsen tamago) on top. The yolk mixes with the sauce and transforms the dish.
Onsen tamago are eggs cooked at around 70°C for 45-60 minutes - the white sets to a soft, custardy texture and the yolk is warm and runny. In practice: bring a pot of water to boil, remove from heat, add cold water to bring temperature to roughly 70°C (use a thermometer, or aim for water that's hot but you can briefly dip a finger in). Add eggs directly from the fridge. Leave for 45 minutes. The result is a soft, custardy egg that breaks over the gyudon perfectly.
Adding an onsen tamago adds approximately 70 kcal and 6g protein. All values are estimates based on ribeye beef and 200g cooked rice per serving.
Gyudon is at its best with marbled ribeye or sirloin, which costs more. For a budget version, use thinly sliced beef chuck or brisket - it takes slightly longer to become tender in the sauce (8-10 minutes rather than 3) but the flavour is good. At £1.50-1.80 per serving with chuck, gyudon is one of the better value high-protein dinners in the Japanese cooking repertoire.
Gyudon is one of several donburi dishes covered in the Japanese home cooking guide, where the full weekly meal plan shows how different rice bowls fit into a week of practical cooking.