Crab cocktail with avocado cream - Gourmet Traveller

Ingredients

• 400 gm cooked blue swimmer or spanner crab meat (see note), thawed
• 1 nashi pear, peeled, finely chopped
• 1 kohlrabi, peeled, finely chopped
• 1 golden shallot, finely chopped
• 2 tsp each finely chopped mint and chives
• 2 tsp smoked dulse flakes (see note), plus extra to serve
• Chervil sprigs, to serve
• Avocado cream
• 1 large avocado, seed removed
• 2 tbsp lemon juice
• 2 tsp wasabi paste
• 80 gm mayonnaise