My family had this weird notion that if you put healthy stuff in Jello that it was a side dish and not a dessert. Nope, you just ruined two foods by making unnatural combinations with them. Mom never did come across a Jello recipe that she thought was a bad idea though.
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Some of the Jello salads out there. Green Jello with carrots (and sometimes raisins) is an abomination. Also, whatever the hell my mom used to make with cottage cheese and orange jello.