Gratin Onion Soup With Tomatoes

Directions

1. 1
   In a large saucepan, cook the onion slowly in butter until caramelized, about 15 minutes.
2. 2
   Add salt and pepper.
3. 3
   Deglaze with port wine.
4. 4
   Add stock and tomatoes.
5. 5
   Bring to boil and let simmer about 10 minutes.
6. 6
   Add salt and pepper.
7. 7
   Put the oven rack in the middle of oven.
8. 8
   Preheat to broil.
9. 9
   Put the soup in oven-proof bowls.
10. 10
    Put slices of toasted bread on soup and sprinkle with cheese.
11. 11
    Broil in oven until melted and golden.