Place the bratwurst on the grill grate and smoke for about 60 minutes.
Slice the onions in half and place on the grill grate next to the brats.
After one hour, pour the beer and brown sugar into an aluminum pan and add the onions and brats. The onions will be fork tender at this point. Cook until internal temperature of the brats reaches 160°F.
Remove brats and onions from the beer, slice or chop the onions and serve up on buns of your choice.
Notes
Nutritional values will be an estimate as the size and kind of bratwurst you choose will determine the actual values. We chose German bratwurst from a German deli. You don't have to do that. Feel free to buy your favorite bratwurst at your local grocery store. Cook to temperature, not necessarily to time. Each bratwurst is also a different size. Ours were quite thick which meant our time to cook was longer. Always check time early.