The Confusing Label Mistake In Costco's Shepherd's Pie - Tasting Table
Briefly

Cottage pie is made with ground beef, while shepherd's pie is made with ground lamb. Costco's version, mislabeled as shepherd's pie, is actually cottage pie.
Costco's Kirkland Signature shepherd's pie contains beef, dehydrated vegetables, and various additives that differ significantly from traditional recipes for shepherd's pie, raising quality concerns.
Care should be taken when purchasing pre-made meals, as many grocery items may contain preservatives and allergens that detract from the original comfort food experience.
Read at Tasting Table
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