Luna Park asparagus soup Recipe

Name: Luna Park asparagus soup Recipe
Ingredients: 1/2 onion, chopped; 1 large baking potato, peeled and chopped; 1 tablespoon butter or oil; 2 1/2 bunches asparagus, cut diagonally in pieces, about 2 1/2 pounds; Water; 1 bunch spinach, stemmed, about 1 pound; Salt, pepper; 1 teaspoon to 1 tablespoon vinegar, optional; Fried asparagus, for garnish; 3 tablespoons chopped Italian parsley, for garnish; 3 asparagus spears; 2 tablespoons flour; 1 egg, beaten; 1/4 cup Italian bread crumbs; Oil for frying