I see, so the condiments are combined together. Mayonnaise is the white stuff, I'm assuming.

[There's a bit of it he can see left on the patty. After spooning the bit, he gives it a lick. Hmmm.] Sour? [Not as good as ketchup, but better than the strong taste of mustard. Probably wouldn't have it by itself, but if it's combined with the other condiments than he wouldn't mind it. Boy, he's learning so many new stuff.]

Onions... [The green stuff is lettuce, and the red slice is tomato. The band looking things are presumably the onions? He pokes at it with a fork.] I assume this is the onion? Well, what did it taste like to you?

[If she doesn't like it...]