The only danger to eating at Cava on vacation is you may find yourself unwilling to try any other restaurant during the course of your stay in Portsmouth. Yes, it is that good, and the menu is so varied, you'll be tempted to return again and again to try it all. Set in a charming former home, down a picturesque alley, the food consists of creative Spanish tapas.  The menu changes, but you might find yourself munching on  chocolate, sea salt, and pistachio oil bocadillos (a type of Spanish sandwich); ricotta gnocchi with Brussels sprouts and chanterelles; or an exquisite plate of roasted baby beets with pickled blueberries and hazelnuts in a red wine reduction. The sweets, too, are amazing.