They continue to praise the cooked food. The more it is served, the more they eat.

This couplet talks about a person who keeps praising the cooked food while simultaneously eating more and more as it's served. It paints a picture of someone whose words of appreciation might not be entirely sincere. They seem to take advantage of hospitality or generosity, consuming an excessive amount simply because it's available, rather than out of genuine hunger or true delight. It's a subtle commentary on those who might flatter others to get more, or who have an insatiable appetite for what's offered, without true appreciation or moderation.