Turkey Barley Soup

Name: Turkey Barley Soup
Ingredients: Stock:; 2 tablespoons vegetable oil; 3 pounds turkey bones; 1 onion, quartered; 1 stalk celery, coarsely chopped; 1 carrot, coarsely chopped; 16 cups water; 2 sprigs fresh thyme; Soup:; 2 1/2 cups water; 1 cup barley; 2 tablespoons olive oil; 1 onion, diced; 2 carrots, sliced; 2 stalks celery, sliced; 2 cloves garlic, minced; 2 cups chopped cooked turkey; 1/4 cup chopped fresh parsley; 2 sprigs fresh thyme, leaves stripped; 1/4 teaspoon salt; 1/4 teaspoon ground black pepper; 1/8 teaspoon cayenne pepper; 1/2 lemon, juiced