It is a green bell pepper that is left in the sun to ripen & turns red.
Pimentos trees are native to tropical regions of the West Indies, Central America and South America. For more information on Pimentos http://www.onestopsolver.com/what-is-allspice.html
Canned (or jarred) roasted red sweet peppers work just fine!
They use a machine. See the Related Links for more information.
Shredded cheese with mayonaise and chopped pimentos.