Fruits, such as nuts and the like, are loaded at an inlet end into an elongated housing having a passage provided with a rotatable screw. At the end adjacent the inlet the screw serves to crush and thoroughly comminute the fruit so that the oil therefrom can be drawn off through strainers. The screw is formed with a thread having gaps which receive flow-interruptors which project inwardly from the housing and which insure complete mixing of the crushed fruit. In addition the screw is formed with a ridge defining a narrow gap with the inner wall of the housing so that no large particles can be left in the finished product. The screw also has a region of lesser diameter where the crushed fruit is degassed by withdrawal of air and vapor through the wall of the housing. The housing and the screw are heated so that as the fruit is being crushed and the oil extracted this fruit is roasted. At the downstream end the paste-like pulp of the fruit is extruded.