Abstract: A method of and device for manufacturing butter. A continuous-operation mechanical churn has at least one butter-making cylinder, a buttermilk extractor, and at least one squeeze-off. Once most of the buttermilk has been extracted, fragments chopped from a block of stored butter or pure fat are accordingly introduced into the remaining mass of grain and blended with it in one of the squeeze-offs and a homogeneous billet of butter is shaped out of the mixture. At least one chopper is accordingly associated with each block of butter or fat and located above the squeeze-off that is upstream in terms of the direction that the mass of grain moves in, and the chopper has a device for advancing the block that is being chopped from.