Imagine a cream soup with the tanginess of the watercress ... Fill a large container with cold water and rinse the watercress bundle. Add baking soda or vinegar to your water to eliminate any ...

Make the most of watercress season with this lovely soup from cookbook author Sophie Dahl, made with the peppery leafy green, zucchini, saffron, and a splash of heavy cream.

Add the watercress, and stir for three minutes. Remove from the heat and blend in a liquidiser. At this point, put the soup in a metal bowl and place it in a sink full of ice-cold water.