Shechamandy with nuts and herbs

• 1 onion
• 3 leeks
• 1 celery heart and stalk
• 1

Chop up the onion, leeks, celery and parsley. Put in 1.25 litres (2 pt) salted boiling water and boil for 5-7 minutes until the water turns slightly green. Make a paste of the flour and the nuts with