Oh, it's a very good pun. Gelatine is made by boiling meat and bones, which is vaguely similar to how jus is made – a kind of gravy made from meat juices. So if you put gelatine in a sweet dish, it becomes a jus dessert – which sounds a bit like "just desert", or comeuppance.
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Aha, I suspected it was juicy :) Thanks, for walking me through that!