A cast-iron pan will catch all those meaty, umami juices instead of dripping them away into the sand (tear). You can put the pan directly on the grill, just make sure to use an oven mitt!
You want your burger patty to be packed so loosely it's almost falling apart. If you pack it like a hockey-puck, it'll taste like a hockey-puck.
I'll say this: It's really hard to over-salt a burger.
Too often flying under the radar, the bun can make or break your burger. Toasting it directly on the grill kicks overall burger deliciousness up a notch.