Place soup mix, carrot, fennel, celery, tomato, onions and 1L (4 cups) water in a slow cooker or large saucepan.

For the slow cooker, cover and cook on low for 11-12 hours or until the veg are all tender.

For the stove top, cover the pan and bring to a gentle simmer for 4-6 hours or until the veg are all tender.

Taste & season, adding a little more water if it looks too thick.