An automated semi-frozen beverage machine, method of use, and method of manufacturing an evaporator cylinder. The machine includes a bowl system including one or more bowls, each having a mixing chamber, a dispensing assembly, and a lid assembly. The beverage machine includes a refrigeration system having a compressor and a condenser, which are mounted in a base cabinet, and an evaporator cylinder mounted within the bowl mixing chamber. The evaporator cylinder is made up of a steel cylinder with copper tubing coiled within. The copper coil within the evaporator cylinder includes flattened outer edges such that the outer edges of the copper tubing make contact with substantially the entire inner surface area of the steel cylinder, increasing heat transfer efficiency. A mixing system includes an auger rotatably mounted in the bowl mixing chamber around the evaporator cylinder for mixing beverages in the bowl.
