Combine the creme fraiche, lemon juice, zest and watercress in a bowl.
Rough chop the watercress then add to the blender with the lemon juice, zest and creme fraiche.
Pulse to get to the required consistency.
Heat gently in a saucepan if liked.
Disclaimer:The nutritional information provided is approximate and is calculated using online tools. Information can vary depending on various factors, but we have endeavoured to be as accurate as possible.