Kompot is the drink of Russian summers: a big pan of water with whatever the garden or market offers, apples, cherries, redcurrants, strawberries, plums, simmered for a few minutes, lightly sweetened and served cold from the fridge. It is what children drink with lunch at school canteens and summer camps from Moscow to Novosibirsk, and dacha cellars are lined with three-litre jars of it bottled for winter. The fruit at the bottom of the glass is everyone's favourite part. Chef's tip: switch off the heat as soon as it boils and let the fruit steep as it cools; long boiling makes it taste stewed and dull.