There is no one definitive recipe for crystalline prawn rings. A quick search online yields a variety of results, including recipes that use different methods of preparation and ingredients. Some recipes call for the prawns to be cooked before they are dipped in the batter, while others recommend that the prawns be raw. The ingredients in the batter also vary, but most recipes call for some combination of flour, cornstarch, salt, pepper, and egg.
Rinse the prawns. Rinse the cucumbers, cut into rings, make a small hole in the middle of each ring, slip a ring onto each prawn tail.
Pass the prawns through 8-fold heated oil, drain off the oil.
Heat sesame oil to 5-fold hot, season with white pepper, drop in minced ginger, cooking wine, soup stock, salt and prawns, stir-fry.