BBC Food - Recipes - Courgette and lemon risotto

Ingredients

• 750ml/1¼ pints chicken or vegetable stock
• 25g/1oz unsalted butter
• 2 shallots , finely chopped
• 1 garlic clove, finely chopped
• 3 sprigs fresh thyme , leaves only
• 200g/7oz risotto rice
• 200ml/7fl oz white wine
• 200g/7oz courgettes , trimmed, cut into 1cm/½in cubes
• 4 heaped tbsp grated parmesan , plus extra to serve
• 1 unwaxed lemon, finely grated zest, plus 1 tbsp lemon juice
• salt and freshly ground black pepper