"Hidden in the basement of a building amidst the buzz of Rua de Santa Catarina (the main commercial street in Porto), Gruta is a rare find for good food and attentive service in the neighborhood. Follow the ramp strung with plants and lights down to the charming dining room with stone walls. Fish and seafood are the stars of the menu (oysters from Sado, carabineiros from Algarve), though it also includes lots of vegetarian options. Best for: Sampling top Portuguese seafood with a modern twist." - Rafael Tonon