Preheat the fryer. In a food processor, fitted with a metal blade, combine the egg, mustard, lemon juice, onions, garlic, and pickles. Process until smooth. Season with salt and pepper. With the machine running, slowly add the oil. Process until all of the oil is used and the mixture is thick. Season the mixture with salt and pepper. Refrigerate until chilled. Season the smelts with salt and pepper. Season the flour with Essence. Dredge the smelts in the flour, coating completely. Fry the smelts until golden, about 2 to 3 minutes. Remove and drain on paper towels. Season with Essence. Serve with the tartar sauce and fried parsley.
Combine all ingredients thoroughly.