sentence: heat some oil in a pan and cook minced beef sentence: add some chopped carrots and onions and cook sentence: add the beef water and a stock cube and simmer sentence: add some tomato ketchup and worcestershire sauce and stir sentence: add some milk mustard and some grated cheese and mash sentence: mix cornstarch with water and pour it into the gravy sentence: once the gravy thickens take it off the heat and pour it to a baking dish sentence: spread the mashed potatoes over the gravy evenly and scour using a fork sentence: sprinkle rest of the cheese on the top and place the dish in the oven