Petit Robert Bistro’s Needham outpost is trying out a few new bar snacks. Drop by between 5:00 and 7:00pm tonight or tomorrow to be their guinea pig and you can test drive some of the new additions for fifty percent off. Look for goodies like crispy thyme waffle fries, burgers (bistro, croquet with ham, Swiss and fried egg or bleu with Roquefort) and flatbreads (saucisson sec or tomato and basil). Snag a seat at the bar if you can. Or call 781.559.0532 for a table.