3 sticks celery
2 medium onions
2 cloves garlic
freshly ground black pepper (optional)
Additional ingredients: 3 chopped leeks + chives to add texture to the soup after being smoothed in the food processor.
In a pot add 1 litre of water + all ingredients, chopped
When they are cooked, place in a food processor until smooth. Add the additional chopped leeks and chives and simmer the soup, add water to reach the desired soupy consistency. Season to taste
Tip: careful with the black pepper, it was a little overpowering; a little goes a long way. Personally I might eliminate it from my recipe next time.