Many food chains , such as Burger King , Wendy 's and McDonald 's , serve hamburgers .
Many burger chains from the United States can be found all over Mexico , including Carl 's Jr. , Sonic , as well as global chains such as McDonald 's and Burger King . Hamburgers in the UK and Ireland are very similar to their US cousins , and the High Street is dominated by the same big two chains as in the U.S. -- McDonald 's and Burger King .