I'm from Ireland, where filling beers precisely up to the brim is practically a religion, & many barmen will even take the glass back & top it up if they see the head diminishing too quickly in the space of time it takes you to pick the freshly poured pint up.
One thing that always struck me as odd is how the culture is seemingly the opposite of this in apparent beer meccas like Belgium - not only are the glasses typically much smaller (this is fine) but they also leave massive gaps at the top. The glass capacity is never treated as being close to the rim at all.
My understanding is Belgian beer culture considers the aroma to be an important part of the experience. But I’ve never been, that’s all through osmosis.
I remember watching the cornetto trilogy ( https://en.wikipedia.org/wiki/Three_Flavours_Cornetto ) and always wondering why on earth they fill up the glasses up to the brim. It is uncomfortable to transport this way and not spill beer.
In Czech Republic they usually pour 3 fingers of head. But the measure line is also part way down the glass, the foam all above the line...
Kind of.
Guinness glasses are exactly a pint, so the Guinness head means you're getting less than a pint of actual beer.
This is tolerated/expected and so de facto correct but de jure perhaps not.
The only sensible approach here is pint-to-line glasses. I don't want my glass filled to the very top where I'll spill it, I want it filled to the pint line. Sadly in the UK up to 5% of the pint is allowed to be foam, but I'd expect any sensible barman in the UK to top me up to the pint line if I asked, and be apologetic about it.
> not only are the glasses typically much smaller (this is fine) but they also leave massive gaps at the top
I'm wondering if this is due to the prevalence of cask ales vs bottle/keg conditioning. The former is relatively uncommon in Belgium and you want the head from the latter.
That said, oversized glassware (e.g. Duvel's tulip for aromatics) and/or fill lines are also used to accommodate the head while still not cheating the customer out of volume.