GetReal, let me clarify McDonald's cooking process for you seeing as members of my family work there (corporate offices)...
McDonald's cooks in the store, raw beef on a a clamshell grill.
Clamshell meaning it works like the 'George Foreman Lean Mean Fat Grilling Machine', it has a hot top and a hot bottom, and your burger is cooked in the middle of these two griddle type things. However, McDonald's doesen't have the corregated shape of the Foreman grill (the peaks and valleys). This corregated shape allows for the fat/grease to run off. So McDonald's burgers are greaser than Foreman burgers.
After they cook your burger, they put it into a tray, and put that tray into their "Made for you" food prep/storage warmers.
When you go to McDonald's and see them assembling burgers by sliding out a tray and taking out an already cooked burger patty, this is what you are seeing.
So in simple summary. McDonald's gets raw burgers delivered to their stores. Teh stores cook the burgers in lots of 20 or so and store them in a warming system, and then assemble them when you order your food.
They claim the 'Made for you' system is "Fast and Fresh". But in my opinion 'Made for you' is 'Slow and Cold'.