French Onion Soup

-In a large pot over medium-high heat, melt the butter. Add in the onions and sauté until softened, about 10 minutes.
-Reduce heat to medium, stir in the salt and sugar and cook for another 35 minutes: stir occasionally.
-Add in the garlic then pour in the red wine to deglaze the pot. Next add in the beef broth, chicken broth, Worcestershire sauce, rosemary, and bay leaf.
-Simmer over medium-low heat for about 20 minutes, stirring occasionally. Remove herbs.
-Mix in vinegar and reduce heat to low and begin to place bread and cheese on top of soup. 
-Broil about 2-3 minutes or until bubbly and golden brown. Serve and enjoy!