So many smash burger recipes call for cooking the smash burgers in a cast iron skillet. They say you can't make a smash burger in a grill. And that's just false. Those recipes say you can't smash the burger on the grill. They say, for the perfect smash burger, you should put the ball of meat directly on a pre-heated cast iron skillet, then smash it within the first 30 seconds that its cooking. And, while that may be the best way according to experts, that's not the only way ... especially if you don't have a cast iron skillet. Or if you're making this for a crowd. The cast iron skillet way can only make two burgers at a time. Any more and the cast iron skillet gets overcrowded. When you're making these directly on a grill, you can make all 16 at once, which is a lot easier for the chef.