Biga is a pizzeria plus — pizza is the only main course, but Del Signore’s menu includes home-fashioned charcuterie and cheeses from Bacco, six attractive salads and a handful of small-plates palate-teasers. Among the salads ($5.50 to $9.50), navel orange is a keeper, with orange sections floating in oil accompanied by olives, onion, and parsley. The more familiar chop salad with tidbits of hearts of palm, artichokes, egg, tomato, cucumber, onion, gorgonzola and ceci beans bursts with freshness. The crusty house-made Italian bread that comes with is exemplary. All of this is the prelude to the pizza and its fermented starter dough (biga) composed of a carefully calibrated blend (“an ancient method”) of flour, purified water and sea salt, all kept at 68 degrees. The resulting dough serves as the foundation for 12-inch ($9-$14) and 18-inch ($14.50-$22) round, thin pizzas that can be selected from a dozen house creations, as well as a nearly infinite number of self-designed pies, with toppings as exotic as duck prosciutto, lardo (pig fat), rapini and vinegar peppers. Those who are red-sauce-averse will be happy with the white-pie options. The desserts, highlighted by house-made gelati (try the cappuccino) and the more-than-perfunctory cannoli, are another of Biga’s strengths.