Heat a skillet with oil. Add onions and saute until they turn translucent. Add leeks as well along with the Zappfresh prawns. Cook until the prawns curl up. Add all of the seasoning along with maize flour. Keep mixing till it comes together and forms a sticky mixture. Allow it cool down and start shaping them into a flat cake. Heat a flat skillet, drizzle some oil, place the cakes and carefully cook on either side till it golden brown. Serve the Coriander Prawn Cakes along with a Tzatziki dip or dips of your choice to create a wonderful appetizer.