Zubereitung

1. 1

   Melt butter with olive oil in a large pot over medium heat.

2. 2

   Add onions and stir continually until translucent.

3. 3

   Add beef broth, marsala and thyme. Simmer for 30 minutes.

4. 4

   Add sugar and season with salt and pepper. Be careful not to over salt!

5. 5

   Ladle soup into oven-safe bowls and place a handful of croutons in each.

6. 6

   Sprinkle parmesan and swiss cheese and layer 2 slices of provolone on top.

7. 7

   Place bowls on cookie sheet and broil in the preheated oven until cheese bubbles and browns.