Hi Stephan, good to hear u’re working on a beer app. Here is the github repo:

https://github.com/green-brass-doberman/recommendation-engine

but it was already a year ago, so things changed. I would suggest go through this quick start guide instead:

https://docs.prediction.io/templates/recommendation/quickstart/

And also the support forum if you have further questions:

https://groups.google.com/forum/#!forum/predictionio-user

Cheers