INGREDIENTS
3
lbs Chicken thighs, boneless skinless
1
(4-inch) fresh rosemary, fresh sprig
2 cloves
Garlic
1
Parsley, fresh
2
Thyme, fresh sprigs
2
lbs Yellow onions
2 cups
Chicken or beef broth, low-sodium
1 tbsp
Balsamic vinegar
2 tbsp
Dijon mustard
1/8 tsp
Baking soda
1
Kosher salt and freshly ground black pepper
1 tbsp
Olive oil
3 tbsp
Butter, unsalted
1 1/2 cups
Gruyere cheese