Well, I was shocked by how good that coffee soda was, and could help myself but to ask "How can I make it myself?". I remember the story of how Dr. Pepper went on to add sugar and club soda to his cough syrup and came up with an awesome drink, so I went over with my simplistic approach:
- Pour espresso shot.
- Add sugar.
- Pour club soda
the ???? step proved to be massive amounts of foam pouring over the glass. It got to the point where most of the drink was just foam and no liquid on the bottom. So just pour the soda slowly , or blend with a small amount of water and then dilute.
It had a good taste, the right amount of sugar and more natural with less gas. I still like the pre-made version though :)