Are Leftovers at Restaurants Over?

Emmett Burke has noticed something unusual in his Manhattan restaurants. Half-eaten pizzas dot tables and bar space, left behind by those who ordered them. At Emmett’s and Emmett’s on Grove, Mr. Burke’s two Chicago-style pizzerias, diners seem increasingly uninterested in asking for boxes to take home leftovers.“I will look at the plates coming back to the kitchen and all the food we are throwing out, and I will…