In a large saute pan, over medium heat, melt the butter. Add the onions. Season with salt and pepper. Saute for 2 minutes. Stir in the garlic and continue to saute for 1 minute. Season the crawfish with Essence. Add the crawfish to the onions. Continue to saute for 2 minutes. Stir in the cream. Season with Worcestershire Sauce and hot sauce. Bring the liquid to a simmer and cook for 4 minutes. Reseason if necessary. Stir in 2 tablespoons of the parsley. Remove from the heat. Spoon the crawfish sauce in the center of each puff pastry. Garnish with the remaining parsley and cheese.
Combine all ingredients thoroughly and store in an airtight jar or container.
Recipe from "New New Orleans Cooking", by Emeril Lagasse and Jessie Tirsch. Published by William and Morrow, 1993.