- 1 tablespoon butter
- 2 tablespoons finely minced onion
- 4 medium-si
- Melt the butter in a saucepan and add the onion. When wilted, add the mushrooms and cook until they give up their liquid. Cook until the liquid evaporates. Sprinkle with salt and pepper.
- Sprinkle with flour, stirring with a wire whisk. When blended, add the stock, stirring rapidly with the whisk. When blended and smooth, continue cooking, stirring occasionally,