Recommended by my daughter and also by the Concierge. We were warned there would be a queue/line (and noticed a similar one at an ice-cream place nearby) and found that quite comforting.
Time queuing went quickly and eventually ordered a hot-pressed sandwich which is plenty for two! Also, it is advisable to have a dessert too — we chose the lemon tart which was excellent. There was a 15 minute wait for this once we ordered so sat with a soft drink and soaked up the atmosphere. When ready, walked and consumed on Dolores Park.