Peek into the kitchen at any busy diner and you’ll likely see a short-order cook standing in front of a flat-top griddle, employing every inch of its wide, flat cooking surface to churn out batch after batch of fried eggs, pancakes, bacon, grilled cheese sandwiches, burgers, and more. A flat-top grill is a scaled-down version of this diner appliance that replaces a grill’s grates wi...