sentence: cut the potatoes into halves sentence: add some salt and dried chicken stock to a pot of water sentence: add the potatoes and boil sentence: take the potatoes out and drain them sentence: add a piece of butter milk and some salt and mash the potatoes using a hand masher sentence: heat some vegetable oil in a pan sentence: add some flour in the pan and stir sentence: add in some chicken stock in the pan and whisk sentence: keep whisking until the gravy turns to a dark color