425g/15oz celeriac, finely diced
110g/4oz onions, finely chipped
fresh flatleaf parsley, chopped, to garnish
450g/1lb plain flour
1 tsp bicarbonate of soda
salt and freshly ground black pepper
25g/1oz toasted hazelnuts, chopped for garnish
olive oil
1 tsp salt
pinch Maldon sea salt
1.2 litres/2 pints chicken stock (vegetarians may substitute with vegetable stock or water)
30g/1oz butter
400ml/14fl oz (approx) buttermilk
60ml/2fl oz cream (optional)
170ml/6fl oz milk