I think the key to success in this endeavor...and yes it does seem that way at times...regardless of the restaurant, lies in the request being made to have it "plain and dry".
It might not be 100% effective where you live, but in every burger joint in Austin, Texas where I have made the request this way, it comes with a bun with meat only.
Best regards,
William R. Sanders
Online Guest Feedback Coordinator
Starwood Hotels & Resorts Worldwide
[email protected]