Abstract: A method of, and apparatus for making hard, dense, vitreous molasses-based animal feed supplement masses, the method comprising heating a molasses composition to a temperature within the range of about 240.degree. F. to about 285.degree. F. to remove all of the water content of the molasses that is necessary to form the desired vitreous masses. A portion of the heating process may be accompanied by an injection of ambient air into the molasses composition being heated. Immediately after heating, the molasses composition is cooled, agitated and de-aerated by directing the molasses composition through a cooler and de-aerator including a conduit in which is positioned an offset beater shaft assembly adapted to separate portions of the composition from the remainder thereof while directing cooling air through the conduit about said portions.