Shepherd's pie should be made with lamb. Any part of the lamb
can do, as the meat will be minced, usually.
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Shepherd's pie is a traditional baked dish of ground or diced meat with a crust of mashed potatoes.
Another Answer
The clue is in the name. A shepherd's pie is ground lamb covered with mashed potatoes. A similar dish, made with ground beef, is called a 'cottage pie'.
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Hortense Warner Ward has written:
'A century of missionary effort' -- subject(s): Corpus Christi,
Texas. Church of the Good Shepherd, Texas Corpus Christi