Lisbon -- Every summer, sellers hawking bolas de Berlim – custard-filled doughnuts without a hole in the middle – throng to Portuguese beaches. Plodding across the boiling sand and ringing a bell to announce their arrival, they deliver these beautifully simple pastries to hungry beachgoers, many of whom associate a trip to the coast with the sweet treat.

A slew of bolas are sold on the beach each year; the presumed number is almost as eyebrow-raising as the calorie content of a big fat bola filled with custard. It’s no surprise, then, that an app promising to be the Uber of bolas has been an immediate success.
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