temper tantrum at the dinner table

Tonight Reed tried to show some power by not finishing his dinner. Noah has a friend over and Reed tried to show how cool he is. Well that kind of back fired. He even tried to pull the card that he does NOT eat tomatoes at dad's house. I called dad. Reed eats tomatoes. So march back to the dinner table and someone finished his food with a very somber look on his face. He just went up against the wrong mom...

what do you do when your child throws tantrums at the dinner table?