Mackerel with pickled vegetables, watermelon & wasabi mayonnaise

Ingredients

• 1 Fresh Mackerel, filleted, pin boned and cleaned, each fillet cut into 2
• 6 x 1cm cubes of watermelon
• 1 tbsp mayonnaise
• 1 x small squeeze of wasabi
• 1 tsp lemon juice
• 3 radishes, sliced thinly
• 2 tsp pickled sushi ginger
• 1 small carrot, peeled into ribbons
• 2 spring onions, sliced thinly
• Baby herb shoots for garnish
• Vegetable oil
• Salt
• pepper
• 100ml rice wine vinegar
• 100ml mirim (or dry sherry)
• pinch of salt
• 1 teaspoon sugar
• 1 tbsp soy sauce
• 1/2 tsp crushed shechuan peppercorns
• pinch of turmeric
• pinch of five spice
• 1 bay leaf
• 1 dried rice cracker spring roll wrapper sea salt flakes
• Dried seaweed (such as nori or dulse)