Are you familiar with the gastronomical wonder known as the beefsteak meal? If not, head to Flank to acquaint yourself. The banquet-style dinners, once a 19th century-celebration staple, are back, and this new Waltham spot does it right: three or four family-style courses of sliced steak and accompaniments that you’re encouraged to eat with your fingers. Yep, your fingers. And to add to the restaurant's gruff tone, there's even a cigar garden where you can finish off your hearty dinner with an after-meal smoke.