Mushrooms au Gratin

½ lb. mushrooms              

½ cup bread-crumbs

1 sliced onion                    

1/16 tsp. pepper

2 Tbsps. cooking oil

¼ tsp. paprika

2 Tbsps. flour                     

1 Tbsp. butter

1 cup mushroom stock (made from stems)

½ tsp. salt

Juice of 1 lemon

Peel the mushrooms and sprinkle salt over them to extract the water. Sauté, the onion, in the oil. Add the flour and brown; add the stock, the pepper, paprika, butter, salt, and lemon-juice and cook the sauce until thickened. Drain the mushrooms and add them to the sauce. Put into a baking-dish, sprinkle with crumbs, and bake until slightly browned.