In a bowl mix together flour, salt and yeast.
Add in the mashed potatoes and mix well. To avoid lumps in potatoes, pass it through a metal sieve.
Add butter, honey and water and mix to form a soft dough.
Transfer to counter and knead it for 8 -10 minutes.
Place in a well oiled bowl, coat the top of the dough with oil and cover with cling wrap.
Set aside until double.
Remove dough from bowl, and divide it into 4 equal portions.
Shape each into a log and roll it tightly.
Pinch ends and place the log seam side down in a greased baking tray.
Cover and set aside for 20 minutes.
Preheat oven to 220C.
Apply milk wash and bake the buns for 15 minutes in the preheated oven.
Remove and cool on wire rack.
