Put the prawns in a sieve and rinse them. Wash lemon hot, grate dry, finely grate peel. Halve the lemon, squeeze approx. 1 tbsp. juice from 1 half. Wash the dill, shake dry. Pluck little flags from the stalks, except for a little bit for garnishing, and cut finely. Mix prawns, dill, oil, lemon peel and juice and let marinate
Clean, wash and cut the radishes into small cubes. Clean and wash the cucumber, cut it in half lengthwise and remove the seeds. Dice flesh into small cubes. Mix mayonnaise, ketchup and brandy, season with salt. Cut 1-2 slices from the remaining lemon half. Cut small lemon corners from the slices
Shrimps with marinade in 4 glasses, add some cocktail sauce to each. Spread cucumber and radish cubes on top, add the rest of the sauce. Garnish with lemon wedges and dill flags. Serve with Grissini sticks