Tuna Carpaccio with Ginger and Radish

Ingredients

• juice 3 limes
• juice 1 red grapefruit
• 2.5cm root ginger, finely grated
• 1tsp caster sugar
• 1tsp fish sauce
• ¼ tsp fine sea salt
• 2 medium carrots, cut into thin matchsticks or sliced with a Julienne peeler
• 150g mixed radishes, finely sliced
• 500g tuna steak
• ½ tbsp sunflower oila
• large handful coriander leaves, finely chopped
• 1 tbsp salted peanuts, finely chopped