A method for producing food products made from a basic alginate or pectin gel by means of gelatinization extrusion. A cylinder is extruded from an extrusion die with a predetermined section. The cylinder has a basic mixture, including a natural food ground product such as a fruit or vegetable, a gelatinizing agent: e.g. alginate or pectin and water. The cylinder is extruded directly from the extrusion outlet die into a vertically elongated receiving bath that contains free calcium ions which ensure the immediate gel setting of an outer wall of the extruded cylinder. The bath has a density such that the extruded cylinder remains free from any stress which might cause the cylinder to warp before the cylinder has sufficiently hardened.

The present invention is directed to a method and apparatus for conveying a product. In accordance with the method aspects of the present invention, the steps comprise providing a flow channel having internal surfaces and introducing the product into the channel and causing the product to move through the channel for flow as a first phase through the channel. Pursuant to a feature of the present invention, a step of simultaneously applying a film of fluid over the internal surfaces is carried out during movement of the product through the channel to provide a second phase to surround the first phase and separate the first phase from the internal surfaces during conveyance of the product through the channel so that the first phase moves as a plug of material through the channel.

The present invention is directed to a method and apparatus for a high-volume, mass production process for extruding a gel wherein the gelled extrudate has a preselected shape and is produced without breaking apart and without loss of integrity of the gel. More specifically, the present invention is directed to a method and apparatus for continuously forming a gelling mixture and conveying the gelling mixture into a plurality of extrusion dies in a manner such that shear forces that may be produced during conveyance through the extrusion dies are eliminated during the critical period when the gelling mixture forms a gel. The gelled extrudate may be produced, for example, in the form of onion rings comprised of a substantially homogeneous gel having a preselected shape. An improved method for cutting off the gelled extrudate to produce the onion rings is also disclosed. As compared to prior art methods for mass producing formed onion rings, the subject method produces onion rings having improved taste, texture, flavor, visual appearance and variations in size and diameter that more closely matches the taste, texture, flavor, visual appearance and variations in size and diameter of natural onion rings, and without having the disadvantages associated with natural onion rings.