Thanks to http://ziggwigs.blogspot.com. Where you can find the recipe.
The courgette soup was destined for the freezer, but it was so good we ate it.
I altered the recipe slightly, using vegetable stock and one pint of liquid so I didn't have to add cornflour. Loads of unpeeled courgettes, and a dash of homemade horseradish sauce. Yum.............
