80²µ/2¾´Ç³ú butterhead lettuce, leaves separated
8 chives, chopped on the diagonal
1 small fennel bulb (about 150g/5½oz), trimmed (fronds reserved) and very finely sliced
1 lemon, cut into wedges
½ tsp lemon juice
100²µ/3½´Ç³ú samphire
2–3 tarragon sprigs, leaves roughly chopped
4 tbsp mustard mayonnaise
salt and black pepper
crusty white bread, to serve
50g/1¾oz brown crab meat
120g/4¼oz white crab meat