Food

The caixa forum restaurant is great value if you are in the area (just over the road from the Mies Van der Rohe pavilion) or visiting the galleries. you can also go up on the roof which is worth a look, don’t think it’s advertised but you just find a lift to the top floor and follow the signs.
I visit BCN a lot as a friend lives there but we tend to eat the menu of the day workers lunch outside of the tourist areas and then locally ‘above the diagonal’ but I don’t remember names of restaurants I’m afraid.

Have eaten at a few of these places:
https://grupotragaluz.com/
Both semi blow-out at Rojo/Negro and some of the other places for lunch.

Have had some decent seafood from here
https://maps.app.goo.gl/hzD46MnacjLYXNGj8?g_st=ic