Union Square Café 21 E 16th St.  New York, NY  10003-3104 Phone: (212) 243-4020 Fax: (212) 627-2673 The Atmosphere The attractive quarters are divided into three dining areas: balcony seating and a cluster of tables on the lower level--both offshoots of the long mahogany bar--and an adjacent, but separate, main dining room. The oversized pussywillows, hunter green wainscoting and country-style furnishings strike bucolic notes amid the polished cherry wood floors and colorful, artwork-lined walls. And despite the proliferation of trendy restaurants in the area, savvy publishing and advertising executives still prefer spending their expense account dollars here.  The Food  Michael Romano's Tuscan-influenced menu proves equally tasteful: grilled lamb chops Scotta Dita with potato-gruyere gratin and sauteed insalata tricolore; pan-roasted salmon with plum tomatoes, almonds, olives and bottarga; wild striped bass Barigoule, with a savory artichoke-spring onion broth and braised lacinato rabe. Weekly specials include a lobster shepherd's pie and roast suckling pig. And don't miss the famous homemade garlic potato chips!