Marsala wine is the secret to this deliciously easy French onion soup. Caramelized onions, in a rich beef broth seasoned with thyme and topped with croutons and melted cheese. A perfect comfort food for cold days!
Butter Onions Beef Stock Marsala Wine Fresh Thyme Sugar Malt Vinegar Caesar Croutons Provolone Cheese Swiss Cheese Grated Parmesan Cheese
Bring beef broth to a boil. Add sugar and malt vinegar. Reduce heat and simmer for 5 minutes. Sauté onions and thyme in butter until caramelized, for about 3-5 min.
Scoop out onions and add to pot of beef broth. Deglaze the skillet with Marsala wine. Carefully pour wine with flavorful onion bits into the pot of broth. Season to taste with salt and pepper.
Ladle soup into oven-safe bowls or ramekins and place a handful of croutons in each. Sprinkle on Parmesan and Swiss cheese then layer 2 slices of provolone on top.
Place bowls on a cookie sheet and broil on low until cheese bubbles and turns golden brown. About 5-7 minutes.