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Export 8 ingredients for grocery delivery
Step 1
Start by warning 1/4 cup of butter in a large skillet over medium heat. After the butter has melted, add the onions and cook until light golden brown and soft, about 40 minutes.
Step 2
Then add the broth, white wine vinegar, bay leaf, and remaining butter and stir to combine. Bring to a boil then reduce to a simmer and allow to cook for at least 15 minutes.
Step 3
Set the broiler to high and divide the broth into four small bowls. Place a piece of French bread in each bowl and cover each with 1/4 cup parmesan then cook under the broiler for 3-5 minutes, until the cheese is bubble and slightly browned.
Step 4
Serve and enjoy!