INGREDIENTS
6
thick slices Applewood smoked bacon
1 1/2
lbs Ground beef
1
Red onion, large
1/3 cup
Balsamic vinegar
1/2 tsp
Dijon mustard
1/2 tsp
Worcestershire sauce
1/2 tsp
Black pepper, freshly ground
1 tsp
Kosher salt
1
Kosher salt and freshly ground black pepper
4
Hamburger buns
1
Gruyere cheese
1/3 cup
Water