Chai rhymes with pie and means tea across half the world. In the places our cooking comes from you can be a long way from a shop or a clean tap and still be handed a glass of it within a minute of sitting down.
There is an old enamel sign — a moustachioed young man mid-sip — that somebody’s grandfather can always quote from memory: this fellow and his brother, always drinking tea.
Nothing quite replaces the first smell of it: boiled long, poured from a height, handed over hot enough that you hold the glass by its rim. Dudh patti tastes of unhurried conversation; kahwa of somewhere colder and further north. We keep both going all day.