Peel and cut the potatoes and spam into cubes.
Boil the potatoes in water until fork tender. (This step is optional but will help to ensure your potato is cooked). Then drain.
Start to fry the spam cubes in a wok. Once the spam cubes are browned, add in the potato and brown the sides as well.
Once the potatoes are browned, add in the baked beans and then the water.
Simmer until potatoes are cooked and sauce thickens.
Add ketchup or Worcestershire to season. Serve warm.