Up in Barcelona’s hills, in the El Coll neighborhood, where the city ends and the sky is cut by the spiky shapes of the pine trees in Collserola Park, Agreste de Fabio & Roser is sprouting up. Emphasizing sustainability and healthy eating, the restaurant is creating delicious dishes that merge Catalan and Italian traditions with contemporary flourishes. Room manager Roser Asensi and her partner, chef Fabio Gambirasi, created this project (the name means “bad weed” in Spanish) less than a year ago and people are already singing their praises. On a recent visit, we could hear words of admiration from different guests flying around the room over the course of our meal.