- 2 leeks, sliced
- 2 yellow onions, sliced
- ¼ pound butter
- Clean leeks. Slice into saucepan along with onions and butter. Cover and simmer 30 minutes. Add mushrooms and cook 10 minutes. Stir in flour. Cook a few minutes.
- Add stock, half-and-half cream, salt, sugar, and pepper. Stir-cook until slightly thickened. Grind through a food mill. Pour back into saucepan and keep warm. Stir in