Prepare 2 small toys of characters they like
Think of story ideas... my kids loves car/bike characters
Use your own 'made-up' voice and animate these toy characters. Get creative with your story is the key ingredient
In this example, the story line where these toys waiting for them to finish their dinner before going back to play with them, ask questions, throw bits of jokes, etc.
They will enjoy the story line with your company and at same time excited about dinner activity. We always add flavors to our story such as toilet training, good manners, bible verses etc.
In no time at all they will finish their meals and we have indirectly taught lots of good values, plus spent valuable quality time.
Praise them for their efforts :)