Asian-style tuna ceviche

INGREDIENTS

• 200 g tuna steak, sashimi quality, from
• , ask your fishmonger
• 1 small bunch of fresh coriander, leaves picked and finely sliced, stalks finely sliced
• zest and juice of 2 limes
• 1 thumb-sized piece of fresh ginger, peeled and finely grated
• 1 teaspoon sesame oil
• 3 tablespoons extra virgin olive oil
• 2 tablespoons low-salt soy sauce
• 2 baby gem lettuces
• 1 fresh red chilli, deseeded and finely chopped, optional