BBC Food - Recipes - Herbed tuna carpaccio with pickled cucumber and bean salad

Ingredients

• 500g/1lb 2oz very fresh tuna loin, trimmed
• 1 lime , juice only
• 4 tbsp roughly chopped flatleaf parsley
• 4 tbsp roughly chopped chervil
• 4 tbsp roughly chopped chives
• 4 tbsp roughly chopped dill
• 1 cucumber , halved lengthways, seeds removed, finely sliced
• 150ml/5fl oz rice wine vinegar
• 2 tbsp caster sugar
• 1 red chilli , seeded and finely sliced
• 1 red onion , finely sliced
• ½ x 400g/7oz canned mixed beans, such as borlotti beans , butter beans and cannellini, rinsed and drained
• 2 tbsp flatleaf parsley , roughly chopped
• salt and freshly ground black pepper
• 50g/2oz mizuna leaves, to serve (optional)