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When a mix-up in Mumbai’s famous ‘dabbawalla’ lunchbox delivery system leads to widower Sajaan (Irrfan Khan) receiving a stacked tiffin box assembled by unappreciated housewife Ila (Nimrat Kaur), it sparks an exchange of letters.

A romance centred on a mix-up of lunchboxes? It’s as slight as it sounds, but there’s enough warmth and wit packed in to suggest this Indian charmer could have breakout potential.

First-time writer/director Ritesh Batra deserves credit for mining gently captivating drama from a pitch that could have just ended with passive-aggressive Post-its left on the office fridge.