erupting volcano cake

I am trying to create an eruption in a volcano cake. The instructions from the young birthday designer are:
It should erupt all over the cake, taste good, and not ruin the cake.

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William W. June 25, 2013
Looks like a lot of people have been looking for this!
http://www.ehow.com/how_4781011_make-edible-erupting-volcano.html
The other ones I found use dry ice, so I thought this one was better.
 
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