Why put a thumbprint in a burger?

Online Answer
To ensure that the meat cooks evenly, make a thumbprint indentation into each patty before it goes on the grill. The indentation helps the patty hold its shape—rather than swelling—as it shrinks during cooking.
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To ensure that the meat cooks evenly, make a thumbprint indentation into each patty before it goes on the grill. The indentation helps the patty hold its shape—rather than swelling—as it shrinks during cooking.