Method of making butter

In a method of making butter with a buttering machine with two buttering cylinders and a buttermilk collector, comprising processing cream into butter grain and buttermilk in a first buttering cylinder of the buttering machine, transferring the resulting mixture to a second buttering cylinder of the buttering machine to separate the buttermilk, transferring the buttermilk to a buttermilk collector, and removing a preliminary portion of the buttermilk from the collector to chill same and returning the chilled buttermilk to the buttering machine, the improvement comprising:

• adding a predetermined amount of a product containing concentrated non-fat dry substance to the buttering machine by supplying the buttermilk from the collector to a separator to obtain an output of concentrated buttermilk with a high level of non-fat dry substance and an output of concentrated buttermilk with a low level of non-fat dry substance and supplying the output of the separator to the buttering machine.