McDonalds "Boston Deli Bagel" - seen down under

I am in Sydney at the moment, and I was surprised to find a "Boston Deli Bagel" on the breakfast menu at MacDonalds here. It's actually quite tasty, but baffling to me why it's a Boston Deli Bagel. Is Boston known for its delis? Something more true to Boston would be a copy of the Dunkin Donuts breakfast sandwich.