Sandaiya is a Japanese restaurant in Samseong 2-dong, Gangnam-gu, Seoul, near Seonjeongneung Station. It serves omurice and tonkatsu, and its lunch menu centers on those two dishes. The tonkatsu is made from meat layered 25 times, which gives it a moist and soft texture. If you expect a chewy texture, the tonkatsu does not suit you.