INGREDIENTS
1 Tbsp
balsamic vinegar
2 cups
chicken broth
2 Tbsps
dijon mustard
4
garlic cloves
1 cup
gruyere cheese
4 servings
kosher salt
2 lbs
onions
4 inches
rosemary
3 lbs
skinless boneless chicken thighs
2 small sprigs
thyme
3 Tbsps
unsalted butter