This is a modified Sunset recipe and I love it. The Scotsman in my life likens it to "Stovies" ..he also gives it two thumbs up. You can substitute ground turkey for the beef if you like. While you make the brown onion gravy, cook the potatoes; boil, bake, or microwave them. If you have cold leftover cooked potatoes, plain or mashed, reheat them in a microwave oven until steaming, then measure. You can make the gravy and assemble the pie through step 5 up to 1 day ahead; cover and chill. Uncover to continue; bake about 35 minutes if chilled.