This one can backfire. My 2 year old loves smoked salmon. She'll eat the roquefort right off my plate.
Telling a kid they won't like something might be just the impetus they need to try it. We might wield this line to trick them into tasting something new. Or we might be saving the best for ourselves. Motives shift, but the lie remains.
And even if we mean it, we never really know till they've tried it.