If you haven’t had the chance yet to visit Tandem Coffee’s cafe and roastery in East Bayside, you can now sample their coffee menu at Gelato Fiasco in the Old Port.

Tandem’s owners, Will and Kathleen Pratt, on Saturday set up a Tandem Pop-up Shop in the gelato store at 425 Fore St. that will be open from 7 to 11 a.m. daily through the end of March. Will Pratt said they’ll be selling Tandem’s two single-origin coffees and all of their espresso drinks.

Tandem has been bringing its mobile set-up to the popular local Pocket Brunches, Pratt said, but this is the first time the company has set up a regular operation in a restaurant-style situation.

It’s also a first for Gelato Fiasco, said Josh Davis, one of the co-founders of the gelato company. He said they came up with the idea one day when he was in Tandem’s cafe at 122 Anderson St., talking with the Pratts over a cup of coffee.

“Basically it was just one of those things we decided to do based on the symbiotic nature of our businesses,” Davis said. “Over coffee one day, we were just talking about it and thought it would be a fun way to team up and do something creative and something fun with a business we respect.”

The Pratts will be working in the gelato shop, selling their coffee themselves, during the pop-up period, but they have already been training the Gelato Fiasco staff to take over.