The name 'Hannekes Boom' refers to a guarding post in Amsterdam's city walls in the 17th century that was also called Hannekes Boom.
This should be ground of the claim made on the website - 'Hannekes Boom, since 1662'.
In reality, this restaurant opened up in 2011, so this historical explanation is a bit of a stretch - but still a nice find.
The location of the cafe/restaurant (with large outdoor seating area) is nice enough to warrant a visit. Very close to the Central Station, yet a bit 'off the beaten track'. From the start, Hannekes Boom has been popular with a hip & young crowd.
At the back is a large outdoor terrace, which is as close as a typical German 'Biergarten' as you'll find it in Amsterdam.
Check the calendar for live music performances!