Vegetable Soup - With poultry

3 tablespoons butter 1 large onion , chopped 1 large leek , chopped 2 medium carrots , chopped 1 medium celery rib , chopped 1 bay leaf 1/4 teaspoon black[...]

2 cups cut up mixed vegetables (such as sliced small zucchini, carrot, celery or red onion.) 1 tablespoon cooking oil or 1 tablespoon olive oil 2 (14 ounce)[...]

1 tablespoon extra virgin olive oil 1 large white onion, coarsley chopped 3 stalks celery , coarsley chopped 8 garlic cloves , minced 2 lbs boneless skinless[...]