For the dill pesto, finely chop the cashews in a blitz chopper. Rinse the dill, dry and chop very finely. Stir through cashews, dill and olive oil. Season vigorously with juice of one lemon, salt and freshly ground pepper. infuse for half an hour.
Rinse and dry the crayfish tails. Heat the oil and roast the crayfish tails in it for 1-2 minutes on each side. Sprinkle with sea salt and arrange on serving plates with the dill pesto and lemon slices. Serve remaining pesto separately.
Pictured.