The invention is directed to apparatus and methods for contacting gas and solids in the manufacture of edibles, and particularly in connection with coating edible particulate solids. A drum is positioned around an inner tube so that an annular space is defined between the drum and the tube. A rotatable spiral element defines a gas pathway in the annular space, such that rotation of the spiral pushes particulate solids through the drum while the solids are contacted with gas in the annular space.
