INGREDIENTS
1 1/3
lbs Ground beef, lean
1
Bibb or butter lettuce
2 tbsp
Onion mixture
2
Onions, large
4 tsp
Parsley, fresh
1/2 tbsp
Thyme, fresh
1/4 cup
Beef broth
1 tsp
Dijon mustard
1/4 cup
Mayonnaise
1 1/2 tsp
Kosher salt
3/4 tsp
Pepper
1 pinch
Salt and pepper
1 tbsp
Olive oil
4
Brioche buns
1/4 cup
Greek yogurt, plain
4 oz
Gruyere cheese
1/4 cup
Red wine