Beef and barley soup

Name: Beef and barley soup
Cuisine: European
Ingredients: °1 tablespoon of olive oil.; °1 pound of cooked beef.; °2 teaspoons minced garlic.; °1 teaspoon of salt.; °1 teaspoon of Italian seasoning.; °1/4 teaspoon black pepper.; °3 large carrots - chopped.; °Chopped celery. I used 2 ribs.; °1/2 cup of barley (washed).; °2 tablespoons of tomato paste.; °4 cups of low-sodium beef broth.; °Freshly chopped parsley for garnish.; to prepare