I visited the Sumiyaki Hamburger Steak Gyusen in Tosu, Saga Prefecture for the first time. This restaurant specializes in 100% Saga beef hamburgers. I was the first customer right after it opened at 11:00 AM. The interior has a Western-style dining atmosphere.What I ordered was…- Sumiyaki Hamburger Set (300g) - JPY 3,740*Includes salad, rice, and Oolong tea.On a sizzling hot teppan, I was served a perfectly round hamburger that was grilled on the outside. The staff cut it in half right in front of me. I guarded it with a paper napkin until the juices settled (to avoid overcooking).The surface of the hamburger was crispy, while the inside was red, going beyond rare to almost raw. I took a bite without any sauce first. It was juicy and absolutely delicious!! The outside was well-cooked and crunchy, while the inside was like Yukke (Korean raw beef dish). The combination of these textures and flavors was a delightful surprise.I dipped it in soy sauce, added garlic from the teppan, and adjusted the flavor with wasabi, green chili, or yuzu pepper as I enjoyed it all at once with rice and the accompanying vegetables. The wasabi was refreshing and paired perfectly. I thought 300g might be a bit too much, but I finished it easily. I believe those who can eat more could handle 400-500g. The smoky flavor left in my mouth made the refreshing Oolong tea a welcome addition.This was purely about enjoying the taste of meat, and personally, it was the best hamburger I’ve ever had. I had no idea there was such a gem in Tosu… It’s definitely worth the trip!