Mushrooms in sour cream.

Ingredients:

30 g unsalted butter 
2 onions, finely chopped 
300 g button mushrooms, wiped and patted dry 
1 tbsp flour 
salt & freshly ground black pepper 
1/4 cup sour cream 

Method:

1. Melt some butter in a frying pan over a medium heat.

2. Add the onions and saute briefly.

3. Stir in the mushrooms and continue to cook for 5-6 minutes until the mushrooms are soft.

4. In a small bowl, combine the rest of butter with the flour, working it to a paste.

5. Stir this paste into the mushrooms and cook for 3 minutes.

6. Add the cream and season to taste.

7. Place the mushrooms into a casserole. Cook in a preheated oven for 20-25 minutes.