Domenico Cornacchia has been in the United States for 25 years. He opened his Osteria in 2009, a fresh, modern restaurant with an outdoor terrace, a few blocks from CIA headquarters. The place is a favorite with politicians, lobbyists and diplomats from around the world. Service is careful and professional, entrusted to well-trained young Italians. Dinner at an Assaggi table leaves a pleasant memory, such pan-fried calamari (cooked briefly over high heat) take on a bittersweet note that lobster mushrooms (typical of Canada and New England) render particularly pleasant. Excellent zucchini blossoms are stuffed with crisp sardines, cherry tomatoes, capers and Cetara anchovy colatura. The wine list covers all Italian regional production with interesting deviations from the classic names. Last summer, Assaggi Osteria opened an adjacent Neapolitan-style pizzeria.