Isaan — a companion dish to larb in the Isaan repertoire; also associated with Northern Thai moo yang (grilled pork)
Nam tok (waterfall) is larb's grilled-beef cousin — where larb uses minced cooked meat, nam tok uses sliced grilled beef (typically a whole steak: ribeye, sirloin, or the Thai preference for skirt/flank) dressed with the same larb dressing components. The 'waterfall' name refers to the juices running off the grilling meat. The beef should be grilled over charcoal to medium-rare — the char from the grill and the pink interior are both essential. The warm, rested slices are dressed immediately with the lime-fish sauce-dried chilli dressing and khao khua. Shallot rings and the same herb assembly as larb complete the dish.
Nam tok's appeal is in the contrast between the charred, smoky exterior of the beef and the bright, acid-herb dressing — the heat of the meat briefly 'cooks' the dressing aromatics and creates a combined flavour that neither the raw dressing nor the plain grilled beef achieves alone.
{"Charcoal grilling is preferred — the char and smoke are flavour elements, not incidental","Medium-rare: internal temperature 55–58°C — the pink juices interact with the dressing","Rest the steak 5 minutes before slicing — allow juice redistribution before slicing thin against the grain","Slice immediately before dressing — don't let slices cool to room temperature before combining with the acid-salt dressing","The same dressing as larb: lime, fish sauce, palm sugar, dried chilli, khao khua, shallot, herbs"}
Flank or skirt steak is the Thai street version — economical, flavourful, and with a pronounced grain that, when sliced correctly against, produces tender, flavour-rich pieces. Ribeye is the premium version used in Bangkok restaurants. Both work — the key variable is the charcoal grill character, not the cut.
{"Grilling to well-done — dry beef has no juice to interact with the dressing and produces a tough, unsatisfying result","Slicing with the grain rather than against — produces chewy, stringy pieces rather than tender slices","Adding the dressing to cold beef — the warm meat is needed for dressing integration","Using only fresh chilli instead of dried chilli flakes — loses the smoky dimension"}