Not all fast-food burgers are prepared the same, and how they begin can be a major difference.

Some restaurant chains start out with fresh beef patties, and they are usually very vocal about it.

Those restaurants are often quieter about their beef, likely because the customers view fresh ingredients more favorably.

eating fast-food

Photo: Shutterstock

Here’s what we know.

In short: McDonald’s currently uses both frozen and fresh beef patties.

It all depends on which burger you order.

mcdonalds cheeseburger

Photo: Shutterstock

Other burger options on the menu are made using 100% ground beef formed into patties and thenflash-frozen.

McDonald’s explains on its website that flash-freezing is used “to seal in fresh flavor.

“They come frozen.

Burger King meal

Photo: SrideeStudio / Shutterstock

Jack in the Box still uses a frozen beef patty for the Smashburger.”

Likewise, a fellow employee previously posted onReddit, “Pretty much everything is frozen.

dairy queen burger

Dairy Queen

jack in the box burger and fries

Photo: Jack in the Box / Facebook

sonic cheeseburger

Photo: Sonic Drive-In / Twitter