Birra del Borgo Rubus/Lamponi on tap at Trappist Provisions in Oakland. A 4 of 4. Deliciously tart and light - tons of fruit notes, including lots of raspberry, as well as a nice relatively thick body for something so tart. The sourness builds over a while, but is wonderful to sip. Italian sours now have a perfect record for me - I’ve really enjoyed every one I’ve had.