For avocado cream, place ingredients in a blender and blend until smooth; season to taste.
Combine crab, pear, kohlrabi, shallot, mint and chives and smoked dulse flakes in a large bowl and toss to combine; season to taste.
Divide avocado cream among cocktail bowls and top with crab mixture. Sprinkle with chervil and extra smoked dulse flakes.
