The Weber Q 120 is a small gas grill with an electric starter and a nonstick cooking surface made from enamel-coated cast iron. Cooking hamburgers on a Weber Q 120 is similar to cooking on other gas grills. The Weber has a control valve, letting you set the flame to an appropriate level to avoid overcooking the meat. Once you've assembled your grill and hooked it up to a small propane tank, you're ready to start grilling your hamburgers. Place a disposable aluminum baking pan in the bottom of the unit to catch grease and prevent messes.
With the grill's lid open, turn the control knob to the start or high setting and push the ignition button to light the grill. Push the button several times until you see flames so you can be sure the grill is lit. Close the lid and let the grill preheat for 10 to 15 minutes on the high setting. Watch the temperature gauge on the outside of the grill. When the temperature reaches 600 degrees Fahrenheit, the grill is ready for grilling burgers
Place your burger patties on the hot grill grates directly over the flames. Grill the patties for three to five minutes per side, depending on how well done you want the burgers. Grill the burgers with the lid open. To make cheeseburgers, place a slice of cheese on top of each patty and close the lid for the last two minutes of cooking time. Check the burgers for doneness with an internal meat thermometer. Pull the burgers from the grill when the internal temperature reaches 155 degrees Fahrenheit for medium burgers.
Turn the heat control knob to the "Off" position and let the grill cool completely. Remove the disposable foil drip pan from the bottom of the unit and throw it and its contents away. Scrape the grill grates with a stainless steel grill brush to remove any leftover cooking debris. You can clean the outside of the grill housing or the grill grates with warm soapy water if necessary. Avoid using any harsh, abrasive cleaners, such as those made with citrus, on your grill.
Make your burger patties on the thicker side to prevent the meat from drying out on the grill. Brush the outside of the patties with olive oil before cooking to keep the meat from sticking to the grill. You can further help your burger patties hold together while cooking by adding eggs and breadcrumbs to the meat before cooking.