Osteria Castelvecchio
On the daily menu you're likely to find both Sienese standards, such as spaghetti saporiti con agli aromi (with tomatoes and herbs), as well as more offbeat selections like bocconcini di pollo alla mediterranea (tender chicken cooked in a robust tomato-and-olive sauce). Husband-and-wife team Simone Romi and Sabrina Fabi are committed to including piatti di verdura (vegetarian dishes) among the choices, and they've put together a great wine list. A tasting menu allows you to sample just about all the daily specials. The little restaurant with high vaulted ceilings is in the oldest part of town.