Seven is the lucky number at Aldea (31 W. 17th St.) in Union Square. Michelin-starred chef George Mendes is celebrating seven years of churning out modern Portuguese dishes with a special new menu. The Seven Signature Bites menu lets guests try a small taste of standouts like the sea urchin toast and charcoal grilled octopus. Diners choose any three items for $21, five for $35 or all seven for $49. The menu is available indefinitely.