Recipe: Delicious Onion soup au gratin

Onion soup au gratin.

You can cook Onion soup au gratin using 7 ingredients and 4 steps. Here is how you cook it.

Ingredients of Onion soup au gratin

1. You need of Bermuda onions.
2. You need of flour.
3. Prepare of butter.
4. You need of strong beef stock.
5. Prepare of Salt pepper Parmesan cheese.
6. It's of Celery salt.
7. It's of Paprika.

Onion soup au gratin step by step

1. Peel onions under water slice thin fry in butter until brown.
2. Add flour mixed with butter to onions.
3. Add stock cook in double boiler.
4. Serve hot with grated cheese and paprika.