Minestrone Soup with potatoes

1 ounce butter 1 gallon chicken stock 1 tablespoon olive oil 1 bay leaf 1/2 lb carrot (1/2-inch cubes) 1/4 lb tomato (1/2-inch cubes) 1/4 lb celery (1/2-inch[...]

1/2 cup leek , finely chopped 3 tablespoons onions , finely chopped 1 garlic clove , finely chopped 2 tablespoons vegetable oil 1 1/2 cups zucchini , chopped[...]

32 ounces canned white navy beans , drained 2 tablespoons olive oil 3/4 cup yellow onion , chopped 2 teaspoons garlic , chopped 3 celery ribs , thinly sliced[...]