Mitch4 notes: “Or is it actually 4th-wall? I thought so because the art seems to show him looking out at us, but both parents are grimacing as though they heard this and are considering their responses.”
“Looks can be deceiving” seems like a phrase too old for Dennis’s purported age, so I’m going with 4th-wall.
Comics I Don't Understand 
I think Dennis is talking to his dad here, although his head is facing halfway between us and Dad. The picture does nothing to make US think it’s delicious. I suspect Dad has just said the pro forma compliment.
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