I had him eat at the table with no pants or shorts on and his chair all the way in, and both hands on the table. I played with his cock and balls (one of my very favorite things to do), first by sitting next to him, and finally (and I know it's not the "DOMMEish" thing to do, but it worked for me) sitting under the table between his legs on a chair cushion.
Whenever I could hear him stop eating, I would stop playing, and I would just slap his hand away if he tried to reach under the table.