Irish Farmhouse Vegetable Soup with Rosemary Croutons | This is a real bowl of comfort, particularly if you choose to add the seriously good rosemary croutons - they keep well in an airtight container and are also lovely added to a salad for flavour and crunch. This soup is perfect for freezing: Allow to cool completely before transferring to a sturdy freezer bag or container and freeze for up to 6 months. Serves: 6 2 carrots, peeled and diced 2 celery sticks, diced 1 leeks, diced 1 large onion,