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1. Heat the oil in a wide flameproof casserole dish or frying pan and add the chicken legs, in batches if needed, and brown on one side for 10 mins, then turn over and brown for a further 10 mins.
2. Transfer the chicken to a plate.
3. Stir the onion, anchovies, garlic, rosemary and thyme into the pan.
4. Reduce the heat to medium and cook for 10 mins with a pinch of salt.
5. Once the onions have softened, pour in the chicken stock and return the legs to the pan.
6. Bring to the boil, then reduce to a low heat.
7. Cover and cook for 35-40 mins until the chicken is cooked through.
8. Remove the legs to a plate and discard the garlic, rosemary and thyme.
9. Stir in the crème fraîche, butter and most of the parsley, then season to taste.
10. When the chicken has 5 mins left, to make the polenta, tip the chicken stock into a saucepan and bring to the boil.
11. Whisk in the polenta and cook for 5 mins, until thickened and bubbling.
12. Remove from the heat, stir in the parmesan and season to taste.
13. Serve the chicken on top of the polenta with a spoonful of sauce and scatter over the remaining parsley.
14. Serve with steamed greens, if you like.

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