In a large saute pan, melt one tablespoon of the butter. Season the beef with salt and pepper. Add the beef to the melted butter and quickly saute for 2 minutes. Remove the beef from the pan and set aside. Add the remaining butter and melt. Add the onions. Season with salt and pepper. Saute the onions for 2 minutes. Add the sausage and continue to saute for 2 minutes. Season the crawfish tails with Essence. Add the crawfish to the pan and saute for 2 minutes. Add the garlic and cream. Season the mixture with salt, pepper, Worcestershire Sauce and hot sauce. Bring the liquid to a boil and reduce to a simmer. Simmer the mixture for 4 to 6 minutes, stirring occasionally. Add the onions and reserved fillet.