What is the blessing for pita with shawarma and salads?

Hello and thank you very much for the swift response to every question! I wanted to know what blessing to recite over pita with shawarma and salads, as well as a hamburger in a bun and similar items. I saw in the book "Encyclopedia of Blessings" that one recites "Borei Minei Mezonot" over pita with falafel, and I wanted to know if this is also correct for the other items. If the matter of falafel is right, why do we not bless the pita and similar items? Thank you very much for your answers that are remarkably satisfying! Blessings to you!