Place all the ingredients in the food processor work bowl. Process until smooth. Taste and adjust the seasonings.
In a small bowl mix the crawfish tails with enough remoulade to coat them. Set aside to marinate. Clean and cut the lettuce in half, down the middle. Place each half on a salad plate. Divide the marinated crawfish tails between two plates, pouring out of the center of the lettuce. Place a dollop of the remoulade on top of the finished dish and garnish with the parsley.
Yield: 4 appetizer portions