Season the shrimp lightly with the Essence and set aside.
In a medium skillet, melt the butter over medium-high heat. Add the onions and cook, stirring, until soft, 2 to 3 minutes. Add the shrimp and pinch of salt and cook, stirring, until the shrimp turn pink, 2 to 3 minutes. Set aside to cool.
In a large pot or deep-fryer, heat the oil to 360 degrees F.
In a large bowl, make the batter by whisking the eggs, milk, baking powder, salt, and cayenne. Add the flour 1/4 cup at a time, beating and incorporating until all is used and the batter is smooth. Stir in the parsley. Add the shrimp mixture and grated zucchini to the batter and fold to mix.
Using a small ice cream scoop measuring 1 1/2 tablespoons, drop the batter into the hot oil. When the fritters pop to the surface, roll them around with a slotted spoon in the oil to brown them evenly and cook until golden brown on all sides, about 3 minutes. Drain on paper towels and season with additional Essence.
Emeril's ESSENCE Creole Seasoning (also referred to as Bayou Blast):
Combine all ingredients thoroughly.
Recipe from "New New Orleans Cooking", by Emeril Lagasse and Jessie Tirsch