Saute the thinly sliced red onions in a saute pan over medium heat until soft. Season with salt and pepper. Set aside. Cook the bacon however you like to cook it. I like to microwave mine.
Mix together the ground sirloin, about 1/4 cup 57 Sauce, and about a Tablespoon of Montreal Steak seasoning. I add the 57 Sauce to add moisture to the sirloin. It does not have a lot of fat, so it needs some help to keep the burgers juicy.
Form the sirloin into patties and keep in the fridge until you are ready to use.
Set up your burger station. Have everything ready to go before you put the burgers on the grill. I let everyone top their own burgers.
I think that I want to blow this picture up and just stare at it all day. Or lick it. Whichever.
Grill your burger to the temperature that you like. Toast the buns and assemble as you wish.