Mash boiled potatoes and do not add milk or butter, or the mash will become too soft to work with.
Chop up the onions and lightly fry.
Add the fried onions, salt, pepper, and the grated cheese to the potatoes.
Make round patties with the potatoes.
Add them to a pan with hot oil and shallow fry for 5 minutes each side, or until golden brown. If you are using leftovers, the goal is to reheat thoroughly all the way through.
Serve as a side dish, an accompaniment, or even as a main dish with salad as a side.