A Finnish colleague once told me the secret of a good glass of aquavit like Koskenkorva is to leave it outside for an hour or two so it will slowly drip out of the bottle as a semi liquid and then put a few drops of Tundra berry liquor.

I forgot whether that should be taken before or after the sauna, but to be on the safe side maybe just before AND after.

With Koskenkorva 60% there's no ice in the bottle.