A gastropub concentrates on quality food. The name is a portmanteau of pub and gastronomy and was coined in 1991 when David Eyre and Mike Belben took over The Eagle pub in Clerkenwell, London. The concept of a restaurant in a pub reinvigorated both pub culture and British dining, though has occasionally attracted criticism for potentially removing the character of traditional pubs.

What two words is 'gastropub' a portanteau of?