Mettaton, what's your favorite food?
"If you're looking for recommendations, darling, I'm afraid ghost food isn't edible for corporeal folk like your lovely self."
"However, I must insist that you try the MTT-Brand Glamburger! It's truly the most luxurious and fabulous food you could ever set your taste buds upon! Plus, it's one-hundred percent accurate to the food eaten on the Surface."
"...That's what I've heard people say about it, anyway. I can't eat it myself, of course."
"It isn't available right now, I'm sorry to say, but I have it on good authority that it'll make a grand return in the future~!"