I am not usually a big Shepherd's Pie fan, but I came upon this recipe one year, when looking for a recipe to use leftover prime rib, and it turned out delicious! It tasted just like a good, old-fashioned down home dish!! I will make this every year after making my traditional prime rib Christmas Dinner, or anytime that I have leftover beef and mashed potatoes. It is truly a cut-above most Shepherd's Pie recipes!