sentence: heat oil and add chopped onion sentence: saute until the onion is soft and translucent sentence: add the ground beef and saute the beef sentence: stir in flour thyme water beef bouillon cubes and worcestershire sauce sentence: simmer the mixture sentence: place the meat in a casserole dish sentence: boil the potatoes sentence: mash the potatoes sentence: stir in the nutmeg cream egg yolk butter salt and pepper sentence: cover the meat mixture with the mashed potatoes sentence: sprinkle the top of the potatoes with the grated cheddar cheese