Kuay Tiew Ruea — Boat Noodle Broth / ก๋วยเตี๋ยวเรือ

Central Thai — originating from the boat communities of the Chao Phraya canal network in Ayutthaya and Bangkok; the small portion tradition reflects the limitations of cooking on a canal boat

Boat noodle soup (kuay tiew ruea, literally 'canal boat noodles') is one of the most flavour-intensive broths in Thai cooking — the dark, rich base is built from pork or beef bones cooked for hours, enriched with dried spices (five-spice, star anise, cinnamon), seasoned with dark soy sauce for colour, and traditionally finished with a small amount of fresh pig's blood stirred in just before service to add viscosity, a metallic depth, and the characteristic dark colour. The blood addition is the defining element — it requires very hot broth to coagulate immediately, and the technique of the blood-addition is what separates an authentic boat noodle broth from a standard pork broth darkened with soy sauce.

• Vietnamese tiết canh uses fresh blood in a similar direct application; Cambodian blood-based pork stews share the blood-enrichment concept; the dark spiced broth logic parallels Chinese master stock preparations.

Boat noodle broth is the most intensely flavoured Thai noodle soup — its complexity requires a series of small bowls to fully appreciate, which is why ordering multiple small portions is the traditional approach.