Add the potatoes and sweet potatoes to the boiling water. Cook for 8 minutes until tender. Heat the margarine and oil in a heavy-based frying pan. Add the onion and garlic and cook for 4 to 5 minutes. Sprinkle over the ground coriander and cook for 1 minute. Drain and mash the potatoes.
In a bowl mix the sprouts + mashed potatoe mixture + fresh coriander and onion mixture. Season with salt and pepper. Using floured hands shape into eight cakes. Heat the vegetable oil in a frying pan. Cook the cakes for 3 to 4 minutes on each side until golden.
posted by T5NF