For more info on PID go herehttp://playground.arduino.cc/Code/PIDLibrary
basically it needs to heat the chocolate to about 50 degrees Celsius hold for a set amount of time then drop the temp down to something like 28 degrees hold for a minute or so then warm up to 31 degrees or so.
Or if you like your logic fuzzy, have a look here
3 waterproof sensor to read chocolate temperature
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