1 kg potatoes, floury potatoes like Agria or Red Rascal work best
1 tbsp butter
1/4 c milk
1 pinch salt
1 pinch ground black pepper
Peel potatoes and cut into small pieces (try to make the pieces about the same size).
Put in a saucepan with enough water to cover.
Bring to the boil, reduce heat to medium and simmer for about 15 minutes.
Cook until potatoes are tender. Test potatoes with a sharp knife to see if they are tender.
Add margarine, milk and seasoning.
Mash well with a fork or potato masher.
Whish with a fork to finish.