You probably get a few of these things each week in the mail. And some of them actually do a good job of obscuring the contents inside, even if you hold the envelope up to the light. But have you ...
1. Melt the butter in a large frying pan, add the onion, then cook gently for a few minutes until softened; add the mushrooms and cook, stirring occasionally, for 2 minutes. 2. Stir in the flour and ...