make your own ! just get some rice, squish it up and its done ! they used to do that in the kindergarten i went to.
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perhaps "squish it up" isnt very good directions
first you have to cook the rice. cook it till its nice and soft, no need to worry about it being al dente or not. then after its cooked, mash it up real good. add water to get it to the consistency you like. basically its just rice starch with water.