Corned Beef and Barley Soup with garlic

2 teaspoons olive oil ½ cup chopped onions 2 cloves garlic 1 stalk celery diced 6 cups broth leftover from simmered corned beef, strained (or use beef broth[...]

2 pounds corned beef 7 cups water 1 each beef bouillon cube low sodium * 1/2 cup onion coarsely chopped 2 each garlic cloves sliced 6 each peppercorns * 2[...]