Preheat BBQ to 375℉
Place sausages, beer and onions in a large heavy bottomed pot or aluminum pan and place on BBQ.
Close lid and cook to bring to a simmer.
Allow sausages to simmer for 10 minutes.
Place chili in different pot and heat, either on the side burner or the BBQ.
Remove the sausages from the pot and grill on all sides about 2 minutes per side.
Continue cooking the beer and onions while the sausages grill to evaporate some of the liquid.
Toast the buns on the BBQ.
Place the buns on a baking sheet that will fit on the BBQ and place a sausage in each bun.
Add some of the onions on top of each sausage.
Top with ¼ cup of chili and ¼ cup of shredded cheese.
Shut off the BBQ and close lid to melt the cheese on the sausages.
Serve with your favourite toppings. See notes for topping ideas.