Well I picked up a 3 pack of Underberg bitters. They come in single servings and are suppose to be a great digestive. I tried it straight and they are definitely bitter. They have overtones of cinnamon and other roots. The gentiana has a medicinal taste, but it's not overpowering. There is a subtle aftertaste that lingers, but it is pleasant.
It happened that I had a can of Coke sitting beside me, so I decided to mix the two together and it actually turned out pretty good. I'm sure traditionalists will say to only drink it straight, but it goes great with Coke too.