1 medium-sized crab is enough for 2 people, 1 large one for 4 people. Feel the crab when you buy it and if it feels surprisingly ligt for its size, ask the fishmonger to break it open – for „lightness“ often indicates that it is „watery“ and you are not getting good solid crab meat.

Either ask fishmonger to dress crab or open the main part of the shell by pulling up the rounded part.
Take out the skin-like „bag“ and the greyish-brown fingers, both of which should be discarded.
Remove all white meat and mix with the meat from the claws.
Remove the brown meat and keep this separately.
To make the salad arrange crab meat on bed of lettuce. Top with mayonnaise and garnish with tomatoes and cucumber.