It's an old tradition where I'm from, and I'll admit I'm rather fond of it.
[He splashes a bit of the wine in then swirls his finger above it. He doesn't actually touch the stuff, but it spirals along with the movement anyway. Once it's mixed to his satisfaction he tries the combination and nods approvingly.]
Much better. I've never much cared for whiskey, but perhaps I'll try that combination next time.