Barbecue ovens are like conventional ovens, but with one important difference: They produce wood smoke, which surrounds the food and adds flavor while it bakes or roasts. Special woods such as hickory, mesquite, or fruitwoods such as apple or cherry must be added to the smoke-producing part of the oven according to the manufacturer’s instructions. This device is usually nothing more complicated than an electric heating element that heats small blocks or chips of the wood so they are hot enough to smoke but not hot enough to burst into flame.