Question to Moms

I have a question as to how people would handle this situation:

You and your family are at a friends house for dinner and she's cooked all day a fantastic beef stew.  My son, comes over and whispers to me, tells me he doesn't like it.  Her feelings would be hurt that he didn't like it (it's happened before).  Now what would you do?  He's hungry, can't eat what she's worked really hard for, and I don't want to hurt her feelings.