The dark, sweet, chicory-blended coffee that Thais drank before espresso arrived — still ubiquitous and genuinely delicious.
Oliang is brewed from a blend of coffee, chicory, corn, and sometimes soybeans — stronger and more bitter than Western coffee; served ice-cold with condensed milk or black.
A cloth filter sock hung on a frame; hot water poured through; the concentrated brew poured over ice in a plastic bag or cup — the bag-with-straw is iconic.
Oliang is 20–40 THB from carts; specialty coffee is 80–180 THB at cafes — both excellent but completely different experiences.
Street carts throughout Bangkok, especially near markets and in residential areas; morning is peak oliang time; many lunch spots also serve it.
Oliang (black iced), Oliang Nom (with milk), Cha Yen (Thai iced tea), Nom Yen (pink milk), Kafae Boran (traditional coffee with condensed milk).
Most vendors add condensed milk and sugar by default — specify "wan noi" (a little sweet) upfront if a lighter version is preferred, since it's rarely adjusted after the fact.