While there's nothing inherently flawed with grills as they are now, if you've ever seared meat on a hot stone, you've discovered there's more to meat than charcoal and propane.
The Pebbles Grill concept is sort of like a George Foreman reinterpreted with a net of blazing-hot rocks. Electric elements heat a series of "pebbles" to deliciously dangerous levels—as indicated by warning lights—before you fold the mesh-like grill over your food.
