Vegetable Stock

Name: Vegetable Stock
Ingredients: 1 tablespoon extra virgin olive oil; 1 large yellow onion, coarsely chopped; 2 celery ribs, chopped; 2 carrots, coarsely chopped; 8 cups water; 2 garlic cloves, crushed; ½ cup coarsely chopped fresh Italian parsley; 1 large bay leaf; ½ teaspoon whole black peppercorns; 1 tablespoon tamari; Salt to taste