There's no wood stack in sight
By definition, barbecue is made by the intermingling of meat, wood smoke, and fire. If there's no sign of cooking wood in plain sight or no distinct smell of smoke in the air, then there's no barbecue in the house. And I don't mean sacks of sawdust that the restaurant sprinkles over a fire to create the illusion of wood smoke. You want to see a cord of oak, pecan, hickory, mesquite, or any other type of smoking wood stacked or piled somewhere in the proximity of a hulking, smoke- and grease-blackened pit. In barbecue, using gas, electricity, solar power, wind turbine, or any other primary heat source other than wood on fire is a big no.