Paprika Beef Goulash

Name: Paprika Beef Goulash
Ingredients: 2 tablespoons good-quality olive oil (divided); 1 onion (peeled and chopped); ½ cup All purpose flour; 1 teaspoon paprika; 1 pinch cayenne pepper; 2 cups canned chopped Tomatoes; 3 ½ cups turkey stock; ½ cup tomato puree; salt (to taste); freshly ground Black pepper (to taste); 16 ounces ground Turkey; 3 cups potatoes (peeled and roughly cut); ½ cup Sour cream; ¼ cup fresh parsley (finely chopped); 4 sprigs fresh parsley (to garnish); ¼ cup grated Cheese (to sprinkle)