The filling is usually simmered with onions, carrots, celery, and peas .Sounds like a cottage pie right Except, cottage pie uses beef and shepherd’s pie uses lamb or mutton.Tips from a successful food blogger on how to build a great food blog, find your audience, learn SEO, develop relationships and take appetizing food photos.If you don’t eat a lot of lamb, I say give this traditional version a try. I think you’ll love it! But no matter which type of meat you choose, this is true comfort food that will warm you from the inside out during the winter months.