TIRSA

Tirsa
C/ Rafael de Campalans 174, L'Hospitalet

This is an outstanding place for cocktails. There is no written menu, but the boss, Manel Tirvió, will make an excellent job trying to guess what you need.
My recommendation: taste the outstanding gin-tònic of gin tanqueray ten.
From a theoretical point of view, this place is not in Barcelona. It is in L'Hospitalet. From a practical point of view, it is really close to Barcelona, very near to Santa Eulàlia metro station.