1 stick celery, finely chopped
1 small fennel bulb, finely chopped (optional)
1 lemon, zest only
1 small brown onion, finely chopped
1 tbsp roughly chopped fresh parsley (optional), to serve
320驳/11陆辞锄 risotto rice
5 tbsp extra virgin olive oil, plus extra to serve
pinch salt
1.3 litres/2录 pints water (or light fish stock)
500g/1lb 2oz prawns in shells, peeled and black vein removed, shells and heads reserved (or 350g/12oz peeled prawns)
100ml/3陆fl oz dry white wine