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Consequently, what kind of onions does McDonald's use on their hamburgers?

Rehydrated Onions, Mcdonald's Style. I worked at McDonald's many years ago. This is the way that they made the onions for the burgers. I did this to go with Recipe #106882.

Also Know, how do you reconstitute dried onions? Add an equal amount of warm tap water to an equal volume of dried onions; 1 cup of water to 1 cup of dried onions. Allow the dried onion to sit for approximately 15 to 20 minutes to fully absorb the water. Drain off excess moisture if the recipe doesn't call for it.

Regarding this, how does McDonald's make their onions?

They ARE onions. They're minced onions that have been dehydrated and packaged at a factory. At the restaurant, our prep person re-hydrates them by placing the dried minced onions in a small tub with holes in the bottom, somewhat like a pasta strainer. This tub is then placed inside another tub filled with water.

What kind of onion is on a Big Mac?

The kicker is the rehydrated onion; that's what really gave it a McDonald's feel. The copycat Big Mac tastes exactly like a Big Mac — no lie, you throw this in a Big Mac box and you'll fool your friends and family 11 out of 10 times.