Paper Cup Coffee
End-of-day pastry waste cut from 18% to 4%
A Seongsu café stopped throwing away a sixth of its daily pastry production by turning the problem into a product.
18% → 4%
Daily waste rate
12
Bags per day
₩6,000
Bag price
1/3
Buyers became regulars
Background
Paper Cup Coffee is a 20-seat specialty café in Seongsu with a small in-house pastry program. The owner, Jisoo, bakes 40 to 60 pastries each morning — canelés, scones, a rotating seasonal loaf. Before joayo, she was throwing away an average of 18% of daily production. She knew the waste was eating her margins but couldn't see a way to stop making pastries customers loved.
What we tried
Instead of discounting pastries individually, we designed a "Paper Cup surprise bag" — three-to-five pastries chosen by the barista, picked up between 18:00 and 19:00. Priced at ₩6,000, roughly a third of the contents' menu value. Cap of 12 bags per day. Pickup is strict: miss the window, the bag goes to the next person on the waitlist.
What happened
Within two weeks the bag was selling out before noon every day. End-of-day waste dropped from 18% to 9% almost immediately. By week six, Jisoo had tuned her morning production to the bag rhythm — she bakes slightly more pastries now, knowing the bag will absorb any surplus. Waste settled at 4%.
The surprise upside
The bag became a gateway product. About a third of bag buyers became regular customers during normal hours within a month. Several told Jisoo they had walked past the café for months without stopping — the bag gave them a reason to cross the threshold.
What Jisoo says
"The waste was the number I looked at every night before closing. Some days I'd throw away 14 pastries I was proud of that morning. The bag turned that pile into a product my regulars fight over. I sleep better."
What's next
Paper Cup is piloting a "baker's cut" version of the bag — larger, ₩12,000, for households rather than individuals — on Saturdays only. Early numbers suggest it doubles Saturday pastry revenue.
“Paper Cup surprise bag”