A rehydration and extrusion apparatus (5) for extruding a rehydrated fluent food product is described. The apparatus has a cylinder (50) having an extrusion die (55) disposed at one end, in which there are a plurality of apertures. A piston (503) is movable along the cylinder to the one end from its other end, and a mixing device (530) is disposed within the cylinder. The cylinder has opening (520, 521) for the supply of powdered food material and water. Motors (56, 57) drive the piston (503) along the elongate chamber and move the mixing device (530) around the cylinder (50).
