This must be a first. Street food – from a nutritionist. And, mercifully, there’s not a stick of celery to be seen. Monica Waltner is famous in Austria. She tends to the digestion of the rich and famous. But she’s currently in Vienna, working up her entry to the BSFAs. It’s an old recipe, dating back to 1867, from the House of Habsburg. “The dish is still very common today” she says. “I’m calling it the HabsBURGER”. Which is also a first. An Austrian with a sense of humour. Who cares. When Monica is in her HY Kitchen serving up her slow, organic hot dogs or rye bread with truffled blood sausage, there’s no time for the laughing.