Shepherd's pie is hearty, comforting dish with a savory meat filling topped with golden brown mashed potatoes. A cold weather classic!
Strain potatoes through a ricer or mash with a fork or masher. Add milk, butter, salt, and pepper and stir well. Cover and reserve.
Add the meat and cook, stirring often, until browned. Drain the fat off and return to the heat. Stir in the flour and cook 2 mins.
Add the tomato paste, mustard, and Worcestershire sauce. Mix well and cook 2 mins.
Add the wine and cook until reduced, about 3 mins and then add the stock.
Stir in the thyme, parsley, and peas.