The present invention relates to a temperature treatment apparatus (1) for solidifying portions of fluid. The apparatus comprises an endless product conveyor belt (7) comprising a plurality of moulds (8) made of elastic material, each of the plurality of moulds having an open end and each of the plurality of moulds being arranged to convey a portion of fluid during solidifying of the same, a first impingement temperature treatment device (4) arranged in a first temperature treatment zone (A), a second impingement temperature treatment device (5) arranged in a second temperature treatment zone (B), wherein the first temperature treatment zone is arranged upstream the second temperature treatment zone with regard to a direction of movement of the portions of fluid during use of the apparatus, wherein the first temperature treatment zone is arranged to solidify a crust on the portions of fluid at least on a surface of the fluid closest to the open end of the moulds when the moulds comprising portions of fluid are conveyed through the first temperature treatment zone, and wherein the second temperature treatment zone is arranged to further solidify each portion of foodstuffs such that at least partly solidified portions are formed when the moulds comprising portions of fluid are conveyed through the second temperature treatment zone.