The Zero-Waste Bar That Books by Email
Hong Kong's closed-loop cocktail bar operates without a reservation platform. Walk in, queue fifteen minutes on a Friday, and drink the city's most disciplined fermentation program.
The white tiles are the first tell. Penicillin looks less like a bar than a working laboratory tucked into the lower ground of Amber Lodge on Hollywood Road, and the fermentation lab visible on the way in is not decoration. Agung Prabowo built this room in 2020 as Hong Kong's first zero-waste cocktail bar, and the closed-loop program is genuinely executed rather than gestured at — the ferments in your glass were made from the peels and pulp of last week's drinks.
The room seats a couple of dozen across a short bar and a few tight tables in roughly 1,520 square feet. Two people works. Three works. Four is the ceiling before the room starts pushing back. There is no Resy page, no Tock landing, no OpenTable link — the reservation system is an email address, and most nights the answer is to walk in and wait.
A working fermentation lab pouring the most disciplined closed-loop cocktails in the city, run without a booking platform and no worse for it.
Editorial Deep
Order The Original — Prabowo's signature and the drink the bar was effectively built to serve. It is the shortest route to what Penicillin is doing that other Hong Kong rooms are not.
White subway tile on the walls, a lab bench visible from the bar, low lighting warmed against the cold surfaces. The apothecary-meets-basement design reads as a working room rather than a set — the fermentation vessels are actually in use, and the compact footprint means the bartenders are working within arm's reach of every seat. Roughly 1,520 square feet, a short counter, a handful of small tables against the wall.
Weeknight rooms lean toward drinks-industry regulars, hotel bartenders on their off nights, and travellers who have done their reading — the fermentation program is a specific draw and the crowd reflects it. Friday and Saturday broaden out toward a Central after-work spillover that arrives around ten and stays until close, and guest shift nights bring a noticeably more electric energy as visiting bartenders take over the well. The room is small enough that the crowd is the crowd — one loud four-top changes the whole space.
Two rounds for two people sits in fair territory for a Central cocktail bar operating at this technical level, and the fermentation work is not something you find at the tier below.
Penicillin is a two-or-three-drink anchor for a serious drinking evening, best on a quiet midweek visit when you can sit at the bar, talk to whoever is pouring, and follow the ferments across the menu. Come back on a guest shift night for a different room entirely. Skip it if you want a table for four, a full dinner, or a menu that reinvents itself every quarter — none of those are what this bar is for.
Order this
Drink this.
The Original, then One Penicillin, One Tree
“Hong Kong's most disciplined fermentation bar, run without a booking platform.”
Walk in midweek and sit at the bar. Order The Original, then One Penicillin, One Tree. Skip if you want dinner or a table for four — this is a compact drinking room built around a genuine closed-loop program, not a group venue. Weekends, email ahead or plan for a fifteen-minute Friday queue.
The Verdict
