I think McD's process has changed since I worked there. At the time all burgers were grilled, prepared identically and then put in warming bins. Since then they've gone to some new process, so that you can order your double quarter-pounder with cheese with NO ONIONS, and they will do it pretty fast. That wasn't possible with the old system.
I do know that they started grilling both sides of the burger at the same time, ala the george foreman grill.
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