Add mushrooms and parsley to the Thermomix bowl. Chop 3 seconds, speed 5.
Add butter and cook 2 minutes / 80 degrees / speed 2.
Add flour, stock and milk. Season with salt & pepper and cook 8 minutes / 100 degrees / speed 2. MC off with the simmering basket on the lid.
Add lemon juice and cream, mix 20 seconds / speed 3. MC on.
Blend 1 minute / increasing speed up to speed 8.
