You should have asked him what toppings he wanted on it. Relish? Mustard? Ketchup? Pickles? Tomato? After getting that straightened out, you ask if he wants fries and a drink. You clarify which drink he wants. You then get his address.
You then tell him, "Thank you very much, mate! It'll be there in 15 minutes or less, and if it's not, you get a second order free!"