(11 August 2014)
Courtesy of Bexy, my Tops and Pots Swap partner from Sweden.

Parboil mushrooms. Roughly chop them & place in pot with 1 tbsp butter, vegetable stock, and sherry, and simmer. In a small skillet, fry onions, carrots, and thyme in 3 tbsp butter. Add tomato paste and flour while stirring. Mix well. Add to mushrooms and stock mix and bring to a boil. Add creme fraiche and let the soup boil slowly for 10-15 minutes. Flavor with salt and cayenne pepper.