How To Make French Onion Soup in the Slow Cooker

INGREDIENTS

Shallot or fresh onion

lbs Yellow onions

10 cups

Beef broth, reduced-sodium

2 tbsp

Balsamic vinegar

Black pepper, Freshly ground

2 tsp

Kosher salt

2 tbsp

Olive oil

Baguette slices per bowl, toasted

2 tbsp

Butter, unsalted

1/3 cup

Gruyere cheese per bowl

3 tbsp

Brandy