Mentos are made by Perfetti Van Melle, an Italian-Dutch company that also makes Fruit-tella, Chupa-Chups and the superbly named “Frisk”.  But anyway – Mentos are small oblate spheroids that taste minty, or fruity, or of whatever taste the people at Perfetti Van Melle put in them at the time.  Possibly most famous for the reaction caused when you drop one into a carbonated drink (please YouTube it), this is – science warning! – due to the nature of their manufacture causing a finely pitted rough surface, as well as the constituent ingredients of both the mint and the beverage.  Lesson over.