The bartender glances back at you only for a moment, before grabbing a stein, shoving it beneath a keg, and yanking on the tap.
Once it is filled to brimming, you uses a flat rule to scrape the froth from the top, and sets it in front of you.
"'At'll be a silver fer the ale an' the room."
Spoiler
Taalkar, you may make a Sense Motive check, if you like.