01 -
Cook the bacon in a skillet over medium heat until crispy. Remove and place on paper towels to drain.
02 -
In the same skillet, add sliced onions and cook over medium heat until caramelized, about 10-15 minutes. Add stout and simmer until reduced by half. Season with salt and pepper. Set aside.
03 -
In a bowl, mix ground beef with Worcestershire sauce, salt, and pepper. Form into 4 patties, slightly larger than the buns.
04 -
Cook patties on a grill or skillet over medium-high heat for 3-4 minutes per side. During the last minute of cooking, top with cheddar cheese to melt.
05 -
In a small bowl, mix sour cream, Dijon mustard, and a pinch of salt. Set aside.
06 -
Melt butter in a pan and toast the buns until golden brown.
07 -
Assemble burgers with patties, caramelized onions, bacon, mustard sauce, and top buns. Serve hot.