I’ve been cooking this a lot recently, after having eaten something similar at our best nearby pub/restaurant, The Mill Race. It came as quite a shock to realise how simple it is, and I thought it deserved to be shared more widely.
Ingredients: mushrooms, cream, butter, salt, pepper, pasta.
Quantities: I really couldn’t say: I just use the amount that seems about right. To give a very rough idea, I used a dozen mushrooms when I last made this, which was for three people, but you could certainly use more. Probably about 100 ml of cream, and a blob of butter about the size of a smallish USB stick. (I propose this as the new standard unit for measuring butter.)
The Reinvigorated Programmer 