It happens when you overheat and burn it (in which case you must toss the chocolate out and start over) and when you let the chocolate come in contact with a little moisture—which is why we are always taught to keep chocolate dry. But chocolate also seizes when you don't add enough water or moisture.
There is not much of a secret or trick to dipping something in chocolate and getting it to harden, actually. Simply melt semisweet chocolate by itself or with a little cream or butter. Dip, then refrigerate. When the chocolate is cooled, it hardens.
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Answer:
It happens when you overheat and burn it (in which case you must toss the chocolate out and start over) and when you let the chocolate come in contact with a little moisture—which is why we are always taught to keep chocolate dry. But chocolate also seizes when you don't add enough water or moisture.
There is not much of a secret or trick to dipping something in chocolate and getting it to harden, actually. Simply melt semisweet chocolate by itself or with a little cream or butter. Dip, then refrigerate. When the chocolate is cooled, it hardens.