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Start by grilling the frozen hamburgers until they develop a nice sear, but be careful not to cook them all the way through.
In a separate container, prepare a mixture of onions, beef broth, and garlic.
Once the burgers are seared, pour the beef broth mixture over the burgers to help keep them moist.
Set up a wire rack chafing dish to hold the burgers and keep them warm for the duration of the party.
Offer onions and condiments on the side so guests can customize their burgers to their liking.