Gref-Völsings ★ 4.6
Gref-Völsings' Braterei window serves Frankfurt's original Rindswurst where it was invented in 1894, four hours a day, weekdays only and gone by 15:00.
Order: Rindswurst in a roll with mustard, eaten on the pavement
Why locals love it: A weekday-lunch-only butcher window on an Ostend traffic artery; you must know the Rindswurst story to bother stopping.
Tip: Come before 14:30 or the day's sausages are gone; the ECB tower crowd knows the drill and arrives at noon sharp.