Preparation
Place the potatoes in a sauce pot and cover by one inch with water. Place it over high heat and bring up to a bubble. Add some salt and boil the potatoes until tender, about 8-10 minutes. Drain the potatoes and return them to the pot and let them sit for a minute to dry out. Add the butter and the cream and a little more salt and some pepper. Using a fork or potato masher, mash them until desired consistency.
Once you have to potatoes going, put the burgers together: In a bowl, combine the sirloin, Worcestershire, parsley, grated onion, salt and pepper, and mix to combine.
