A roasting and glazing apparatus comprising a roaster housing, a roaster bowl disposed within the roaster housing for receiving a mixture of nuts and sugar, an agitator rotatably mounted within the roaster bowl for mixing the mixture, and a heater controlled to selectively heat the roaster bowl. The agitator includes at least two blades for mixing the nut/sugar mixture during a roasting or glazing operation. The agitator also includes a central hub and each of the blades extends from the central hub and includes a respective substantially vertical component and a respective horizontal component. Each horizontal component has a bottom surface that is disposed adjacent to the floor of the roaster bowl, and the bottom surface extends upward from its front edge to its rear edge at a relief angle of at least 5° relative to the roaster bowl floor. The agitator with such structure is able to prevent/minimize build-up of sugar from the underside of its blades, which in turn prevents blade seizure during operation, among providing other benefits. Each blade may also beneficially have a top surface that extends from the front edge to the rear edge at substantially a 30° angle relative to the roaster bowl floor to provide enhanced mixing and other benefits.