Chicken braised in cider and chorizo

INGREDIENTS

• 2 tbsp olive oil
• 4 whole chicken legs
• 225g/8oz chorizo
• 6 shallots
• 2 tbsp plain flour
• 600ml/1 pint dry cider
• 150ml/¼ pint chicken stock
• 1 heaped tbsp Dijon mustard
• and freshly ground saltblack pepper
• 3 tbsp double cream
• 1 celeriac
• squeeze fresh lemon juice
• 25g/1oz butter
• 1-2 tbsp single cream
• and freshly ground saltwhite pepper
• steamed green beans