I would like to make gingerbread houses with my aging in-laws. They're both very interested and think it would be fun. But, they're both on very strict diets and should not eat them. Can you think of something to add to the dough and icing that would make them both taste terrible? Something edible, but just disgusting so they wouldn't be tempted to eat it. Add a bunch of garlic powder? Or some really wrong extract? Just curious if you have any experience in deliberately making something taste bad!

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