In a large bowl, mix the prawn, eggwhite, spring onions, ginger, coriander, shitake mushrooms, soy sauce and sesame oil together. Use your hand to knead the mixture together until it come together and is slightly sticky.
Place spring roll wrapper on a flat surface with one of the points facing you. Place approximately 2 tbs. of the mixture on the bottom third of the wrapper. Make a neat sausage shape of the prawn mixture and fold in the point closest to you. Now fold in both right and left points and finally roll into a tight cylinder. Dap with some water (that has been mixed with a little flour to form a paste) and seal. Repeat the process and place under a damp cloth until ready to deep fry. Heat the oil in a deep pot to 190?C. Carefully add a small batch at a time of spring rolls. Cook until golden brown all over. Drain on some paper towelling and serve hot with the dipping sauce.