When baristas throw down, things could get pretty steamy

Boston baristas converge at the Ledge in Dorchester Lower Mills on Saturday for the second annual Flat Black Barista Throwdown to see who makes the meanest coffee in town.

Each competitor will prepare espresso, latte/cappuccino art and original signature drinks to exacting standards in a six-minute performance set to their choice of music. Local celebrity judges will evaluate each performance, including barista knowledge, the taste of beverages served, cleanliness, creativity, technical skill and overall presentation.

The winner gets a Rancillio Espresso machine.

There'll be pre-competition practice rounds at which the public can tasted the brews between 2 and 3 p.m., with the actual battling starting at 3. Admission is free, but a $20 donation for the Greater Boston Food Bank is suggested.