Boil your potatoes in water with salt.After completely cooked.Mash till it forms a thick consistency.(This involves those without blender or when there is no electricity to use the blender).(With a blender,you blend the potatoes after frying a little.)

Fry your onions and add ginger and garlic paste then add the rosemary leaves and cook a little.

Add the mashed potatoes in the sufuria with the fried ingredients and add milk bit by bit as you stir till it forms the abit thick soup consistency.