Cadbury Caramilk
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Caramilk (until recently called Caramel in the UK, now known as Dairy Milk with Caramel) is a chocolate bar made by Cadbury. It consists of liquid caramel held in chocolate pockets.
In North America, Cadbury has an ongoing promotional campaign employing the "Caramilk Secret" or "Secret of the Caramilk Bar". They make people wonder how they get the soft, flowing caramel into the chocolate pockets of the Caramilk bar.
Production
Since the actual production process for Caramilk bars is a trade secret, there are many theories as to how they are made.
Many people believe the bars are made using a shell moulding process which basically entails lining a mould with chocolate, filling it with caramel, and then topping it off with chocolate.
Others believe the caramel starts out frozen. In this process, solid caramel drops are made by freezing fixed amounts of caramel syrup into a round shape. The chocolate portion of the bar is made in two halves (which explains the seam running around the bar's perimeter in its final form). The caramel drops are placed into the bottom chocolate half, and then the top chocolate half is placed on top, forming the whole bar. Then the bar is allowed to reach room temperature, at which point the caramel drops turn liquid.
Another theory involves the enzyme invertase: start with a base of solid chocolate, place blocks of solid caramel treated with invertase on the chocolate bottom, pour chocolate over the blocks. In about a week and a half, the process is complete, and the solid caramel has become liquid.
External links
Cadbury's Caramilk Bar Secret (http://www3.ns.sympatico.ca/mt-edward/cadbury.htm) - description of shell moulding processfr:Caramilk