Good stock provides the flavour base for this delicate broth. The polenta accompaniment is prepared in advance, so the soup is simple to cook at the last minute.
When you're in a hurry, serve the soup with cornbread instead of the polenta sticks.
• If don't make your own low-salt stock, try a high-quality commercial stock rather than a stock cube to keep the added salt to the minimum.
• Celery and fennel provide potassium. Celery also acts as a diuretic, helping to reduce fluid and salt retention.
• White fish is very low in fat and kilojoules.
GI estimate medium.