Frozen, preformed ground-beef patties are a quick, economical and easy way to grill hamburgers for a crowd. If time allows, you can defrost the beef patties in the refrigerator prior to grilling. However, if you need the burgers in a hurry or don't have enough refrigerator space to thaw large amounts of frozen burgers, you can grill the patties directly from the freezer. Always check the manufacturer's instructions on the label for specific information about cooking your particular brand of beef patty.
Preheat the grill to medium-low. That's 325 degrees Fahrenheit for a gas grill, or until you can hold your hand comfortably three inches above a charcoal grill grate for six to seven seconds.
Use a butter knife to separate the number of burger patties you want to grill from the stack of frozen patties. Rewrap any remaining patties and put them back in the freezer.
Place the frozen beef patties on the grill. Using a metal flipper, turn the patties about every five minutes for 20 to 25 minutes.
Remove one of the patties from the grill and place it on a clean plate. Use a meat thermometer to check that the internal temperature of the patty has reached 160 degrees Fahrenheit.