A gelled food product is prepared by opening a closed container of thermo-reversible gel that is based on polysaccharide gelling agent, heating gel to a temperature of at least 60 C. A slidable valve member within the body member is pressurized against the fitting to seal the coupler device while lubricating fluid is passed therethrough. To enhance the transition from the first main portion to the second main portion, the second tubular member can include a fillet surface between the second main portion and the second interface portion. Pushers for receiving and delivering the wafer between the linear transporters and the top rings are provided at the transferring positions as the wafer receivingdelivering positions. The picking assembly is designed for a high degree of accuracy.