Ondersteboven is a craft beer brand created by master brewer Marc Janssen under the umbrella of Royal Grolsch, one of the oldest and largest breweries in the Netherlands, founded in 1615 in Groenlo. The brand was born from Janssen's personal curiosity, family history, and a passion for experimentation, resulting in a playful and distinctive identity within the Grolsch portfolio. The name — Dutch for 'upside down' — reflects the brand's spirit of turning conventions on their head. Ondersteboven focuses on characterful, exploratory beer styles that stand apart from mainstream lager. The range is known for its bold flavour profiles and creative approach to brewing. One notable beer in the lineup is Hangende Harry, described as a fresh and full-bodied IPA brewed with a generous hop bill, making it smooth and highly drinkable. The brand embraces an independent and unconventional character, positioning itself as an eigenzinnig — free-spirited — addition to the Dutch beer scene. Ondersteboven has gained recognition among Dutch beer enthusiasts and appeared in the Bierista Beer Top 100 of 2024, with Hangende Harry earning a spot on that list. The brand operates as part of Royal Grolsch, which is headquartered at Brouwerslaan 1 in Enschede, where the brewery has been located since the opening of its modern facility in 2004.