It’s a really nice compliment to a gin and tonic. I noticed that in Iceland/Finland/Estonia where they also put lingonberries in this cocktail! I can’t get those around here, though. You get more rosemary as the level of the beverage goes down and the rosemary thaws and is exposed to the air. The scent fills the bowl of the glass and adds to the olfactory experience of taking a sip. I’m not sure the experience would be the same in a glass with a different shape!
You know, it really didn’t. I think there’s enough surface area frozen to the bottom of the glass that it stays stuck for a while. It seemed like the rosemary was eventually floating, but pretty much free of ice in my recollection. I suppose if you held it in your hand vs. setting it down between drinks and were a slower drinker it might be different. But I do set it down and have a hard time saving any beverage that’s drinking temp!