That rules out a lot of options. Marshmallows would be out. Honey roasted peanuts would be out. Almost every salad dressing would be out. However, cyanide is a single ingredient.
CD
It would be a silly challenge if any ready made product made from several ingredients, was meant. There would be loads and loads of 'ready made products' which couldn't be used (as well as quite a few which could, of course).
Cyanide is lethal so it wouldn't be used in any recipe unless you wanted to kill someone.
So: any (non lethal!) individual ingredient which is not a ready made product made from several ingredients is what we are looking for.
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