[OSM-newbies] Tag to map drinking terrace next to the pub?

[Sebastian Arcus]

I can't figure out what is the best way to tag the space outside a pub 
with tables and seats for drinking and/or eating. On some pubs I've 
marked it with leisure=garden (when it is surfaced with grass), but in 
this instance the space is clearly asphalted - so do I still tag as 
leisure=garden? I know the actual pub can have extra tags to indicate 
that it has a beer garden - but as I've put the pub tag on the building 
- what should I use for the space outside?

Or am I going about it all wrong? Should I just tag the entire area 
(building + outside) as amenity=pub, and just tag the building with 
building=yes only?

Sebastian