Salmon Burgers with Wasabi Mayo and Avocado

Ingredients

• 600g skinless, boneless salmon fillet, chopped
• 1 egg white
• 1 tbsp pickled ginger, chopped
• 3 spring onions, chopped
• 85g breadcrumbs
• Handful frozen peas, defrosted
• Handful basil leaves, chopped
• 4 ciabatta buns, to serve
• Oil, for cooking
• Lettuce leaves, to serve
• 6 tablespoons mayonnaise
• 2 teaspoons wasabi, or to taste
• 1 avocado
• 1 teaspoon lime juice
• ½ teaspoon fish sauce
• Pinch white pepper
• 2 tablespoons yoghurt
• 70ml rice vinegar
• 170ml tap hot water
• 25g caster sugar
• 2 teaspoons sea salt
• 1 red onion, very finely sliced