FOR A GLIMPSE of how immigration is changing Poland, head to Hala Koszyki, an Instagram-friendly food hall in the middle of Warsaw. Take an Uber and there is a good chance the driver will be from Belarus. Inside, Ukrainian waiters and chefs toil over sushi and tapas. Outside, straddling their scooters, a group of UberEats riders from India and elsewhere in South Asia wait to take orders from any Varsovians who fancy a night in.
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