Another great sauce from epicurious!
1/3 fresh spinach, chopped
1/4 cup chopped arugula leaves
1/4 cup fresh Italian parsley leaves (finely chopped)
1/2 cup mayonnaise
6tbsp drained prepared white horseradish
2 1/2 tbsp (or more) dry white wine
2 tbsp fresh lemon juice
1 tbsp fresh lime juice
Place spinach, parsley and arugula. Add remaining ingredients and blend until smooth. Add more wine by the tablespoon to thin to desired consistancy. Season with salt and pepper.
This can be made 1 day ahead and be kept, covered, in the fridge.