Legend says this sauce was first made by Chef Philip Roemer at the Palace Hotel in San Francisco in 1923. He wanted to pay tribute to the actor George Arliss and his hit play, The Green Goddess. However, it is simply a variation of Sauce Au Vert (Green Sauce) which initially appeared at the court of Louis XIII. Then, apparently, the sauce was served with green eel.
Wherever it originated, it is simply the most delicious sauce or dressing. It goes with just about everything and is dead easy to make. Do have a go at making it. You may well find it becomes a staple in your cooking armoury ~ makes about 3 jars.