Cook the potatoes in a pan of boiling water for 20 minutes, or until soft. Drain, return to the Pan, and mash with a potato masher. Allow to cool.
Meanwhile, put the fish into a steamer, cover with the lid, and steam over low heat for about 10 minutes, or until cooked.
If you don't have a steamer, put a trivet or upturned plate into the base (bottom) of a large pan and pour in enough boiling water to come up to the trivet. Place the fish on a lightly oiled plate, cover with another plate or a piece of lightly oiled foil, and carefully put into the pan. Cover and cook.
Remove from the heat, uncover and allow to cool.
Flake the fish into a bowl, add the mashed potatoes, spring onions, ginger, chillies, and 1 egg. Season with salt and mix well to combine. Divide into 20 small balls, then flatten them into small burger patty-like shapes.
Put the remaining egg in a shallow dish and beat lightly, then spread the breadcrumbs out on a plate. Dip the patties first in the beaten egg, then in the breadcrumbs to coat.
Heat the oil in a non-stick frying pan (skillet) over low heat. Working in batches, fry the patties for about 8-10 minutes, or until golden brown on both sides and hot all the way through.
Remove with a slotted spoon and drain on kitchen paper (paper towels). Serve with lemon wedges.