Add your sweet potatoes to a pan of boiling water and cook for 10 minutes before draining and allowing to cool.
Meanwhile, add all other ingredients, except the oil and flour, to a mixing bowl and mix together, being careful not to let your smoked trout break down into flakes.
When your sweet potato has cooked, smash it into a rough mash and add to your mixture.
Stir everything together so that you have an even mix.
Now take golf ball sized pieces of mixture and roll into a ball in your hands before patting flat to form your fish cakes.
Keep going until you have used all the mixture and you have all your fish cakes.
Now coat your fish cakes in the corn flour or galeta unu. You can do this by sprinkling it over each side of your fish cakes on a large serving plate or by dipping them individually into the flour.
Heat your sunflower oil in a frying pan over a medium heat.
Now fry your fish cakes in batches leaving them to fry for 3-4 minutes on each side until golden and crisp.
Remove from the heat and serve immediately.