Indoor Contact Grills
George Foreman Grills (Salton) dominate the indoor grill market with something like a reputed 80% market share. With dozens of models in attractive designer colors George Foreman Grills are not likely to give up their #1 position anytime soon.
Most [tag]George Foreman grill[/tag] models have lids with heating elements. This design is called a [tag]contact grill[/tag] because the food is heated simultaneously on the top and bottom. This is logically enough the fastest indoor grilling method, and will cook a burger in 3 to 6 minutes. The main limitation is that the lid will not fit properly over food more than 1″ thick.
Open grills like the Sanyo Electric Indoor Barbeque Grill cook on one side at a time. The advantage of the open grill is that there is no limit to food thickness. 2″ steaks are good to go. Open grills provide better searing and grill marks than contact grills. Burgers will take 10 to 20 minutes on an open grill.
Contact and open grills do not heat much above 400 degrees. Your oven broiler probably gets to over 600 degrees and will produce much crispier results than either.
One other alternative is the Cast Iron Stove Top Griddle which is less convenient but can produce higher heat when placed directly on top of a gas or electric heating element. The ribbed structure produces nice searing marks on steaks and burgers.

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