Citrus-seared tuna with crispy noodles, herbs and chilli

Squeeze the grapefruit juice and pour into a sandwich bag with the fish sauce. Add the piece of tuna. Tie up the bag, squeezing out most of the air so the tuna is completely covered in the juice. Leave for 40 minutes, after which time the outside of the tuna will be pale and "cooked". Now carefully pour the grapefruit juice from the bag into a bowl, dry off the tuna and put to one side.

Ingredients

• 2 pink grapefruits
• 1 tablespoon fish sauce
• 500 g piece tuna , from sustainable sources, ask your fishmonger
• 1 tablespoon sesame oil
• 6 tablespoons olive oil , plus extra for frying
• 2-3 fresh red chillies , very finely sliced
• sea salt
• freshly ground black pepper
• 1 large bunch fresh coriander
• 1 small bunch fresh mint
• 2 good handfuls of glass or cellophane noodles
• 4 spring onions , finely sliced at an angle

http://www.jamieoliver.com/recipes/fish-recipes/citrus-seared-tuna-with-crispy-noodles-herbs-and-chilli/