Green Sauce

I had never had Green Sauce until I came to America. But it certainly was delicious with poached fish. I asked a few people for a recipe, and they looked blankly at me, so in the end I made a recipe up. 1 bunch Watercress - using only the top half of the bunch 1 bunch Dill - use only leaves 1/2 bunch parsley leaves 2 cups Mayonaise 1 cup sour cream salt to taste Blend all the ingredients in a food processor. Can make ahead of time.