Clean, wash and slice the cucumber. Mix cucumber slices and 1/2 teaspoon salt, let it stand for about 30 minutes. Roast the sesame seeds in a pan without fat until golden brown, take them out and let them cool down
Peel the shrimps, except for the tail fin, and remove the intestines. Wash shrimps and pat dry
Onions peel, halve and in strips cut. Clean, wash and cut the chillies into rings, removing the white seeds. Season vinegar with salt, pepper and sugar, fold in 3 tablespoons of oil. Wash coriander, shake dry, pluck leaves from the stalks and chop coarsely. Stir the coriander and chilli sauce into the vinaigrette
Rinse and drain the cucumber. Mix cucumber, onions, chilli pepper and vinaigrette in a bowl
Heat 1 tablespoon of oil in a large frying pan. Fry the prawns for 3-4 minutes, season with salt and pepper, remove and immediately turn in the sesame seeds. Put the prawns on skewers. Season salad again, arrange with the prawns