French toast's anonymous creator chose the name he (or more likely, she) did not because the dish came from France, but more as an homage to France and French cooking, a recognition that the dish was inspired by French cooking techniques and ingredients. Brazil's beirute sandwich was given its name for similar reasons.
|Levantine immigrants, Brazil, early 20th century|
No doubt it was the Levantine bread used that caused the sandwich to be called beirute, because it's the one essential ingredient of a beirute. The meat, cheese and everything else that goes into the filling can vary from place to place and from restaurant to restaurant, but if it's not served on pão sírio, it's not a beirute.
Most typical recipes, however, do include some sort of cold meat and slices of cheese, making the sandwich a member of the Brazilian meat/cheese sandwich family along with the Bauru and the misto quente. The classic beirute is filled with sliced cold roast beef, sliced cheese, a fried egg, plus lettuce, tomato and mayonnaise. In a beirute, the filling goes between two whole pieces of pão sírio, not into the pocket, making the sandwich a true meal in itself. This is not finger food - a good beirute will fill the whole plate and requires nothing else to make a complete and satisfying lunch.