Mushroom and celery soup, made with thyme and milk.

I'm slightly obsessed with mushrooms at the moment.  Like celery, they have very distinctive and strong tastes but are often drowned in sauces or side lined.  This soup is really simple as it uses only four base ingredients (as above).  You could of course add a small amount of cream, but I like the simplicity of it made with milk for a weekday lunch.