I actually got this from the Food Network, Chef Geoffrey Zakarian, and it is called Romaine Marmalade and Watercress, but to me it was a wonderful green sauce that I put on my steak and it was tasty:

4 bunches organic watercress, stems removed (about 2 cups)
2 whole leaves romaine lettuce
1 small clove garlic
1/4 bunch fresh cilantro, trimmed
1/4 bunch fresh flat-leaf parsley, trimmed
Fresh lemon juice
Fine sea salt and freshly ground pepper
2 Tablespoons extra virgin olive oil

Puree in blender until smooth.