Pour some beer in a large aluminum roaster pan.
Add some beer, butter, and onion and place on a grill over low to medium heat.
Grill brats and beef hot dogs.
When done, place in a roaster pan.
The beer bath keeps the dogs and brats most.
Serve on a good bun with all the condiments.
This is a great way to cook for a large amount of people and not have the food dry out.