In college there was a burger joint right off campus. They had great hamburgers and Guinness. They also had an ice cream bar. My room mate and I would eat there almost every day... and always had ice cream for dessert.
One day my room mate had not finished his Guinness when the waitress brought the ice cream. He thought about it for a second... looked to me... I nodded and we each plopped a scoop of vanilla in the Guinness.
From that day on, it has been a regular thing. Almost everyone I introduce it to likes it.
Sounds pretty simple, like my brother-in-law Phil. But unlike Phil, this plan just might work.