1. Bring chicken or game stock to simmer in a heavy bottom saucepan.
2. Add lemon peel.
3. Add rosemary.
4. Drain artichokes.
5. Simmer everything for 15 minutes without boiling.
6. Covering with lid.
7. Remove lemon and rosemary.
8. Add pre-cooked lentils, hazelnuts and celery.
9. Return to heat and simmer for further 10 minutes or untill artichokes are tender.
10. Finish by adding 50g butter gently shaken into casserole.

Source: My collection - Jeff Baker - J Bakers Bistro Moderne