Grind dried shrimps, lemon grass, red
chilies, garlic and shallots together. Peel the sweet potatoes and cut
into small cubes. Boil with salt until cooked. Then remove and mash.
Mix the mashed potatoes with flour and knead until soft. Divide into
equal portions. Start preparing the filling by mixing all the
ingredients together and fry in 3 tbsp of oil until it becomes dry.
Take a portion of the sweet potato mixture and flatten slightly. Put a
small amount of the fillings in the centre and seal. Heat oil in pan
and fry the cakes until golden.