This is really more of a guideline than a recipe. It recipe will yield enough pancakes for 2 people.
Take leftover cooked fish pieces (preferably plain poached or steamed fish, about 1/2 a fillet), remove any bones and flake with a fork. Put in a bowl with finely chopped, cooked potatoes (2-3 small ones); one small, finely chopped onion; and garlic to taste.
Stir in some flour (approx. 3 tbs in a recipe for two), and 1 tbs potato starch or cornflour. Flavour with salt and your favourite fish spice mix . Add one beaten egg. Thin with milk to the consistency of thin porridge. Fry in a medium hot skillet until golden and serve with potatoes, melted butter, and tomato wedges on the side.