Bread filled, folded, wrapped or topped with other foods appears in many cuisines. Names, histories and definitions vary; the goal here is to notice useful structural ideas.
Bánh mì — Vietnam
A light, crisp roll may hold pâté, meats, pickled vegetables, cucumber, herbs and chile. Its strength is contrast: rich filling, sharp pickles, fresh herbs and airy bread.
Katsu sando — Japan
A breaded cutlet on soft milk bread, often with a thick, sweet-savory sauce and cabbage. Trimming and neat compression create an even bite without crushing the coating.
Bocadillo — Spain
A baguette-style bread with fillings such as cured meat, cheese, omelet or tuna. The simple format depends on ingredient quality and bread that is crisp but not jaw-breaking.
Croque monsieur — France
Ham and cheese on bread, browned with butter and often béchamel. It shows how a sandwich can become a plated hot dish; heat control prevents the sauce and cheese from overwhelming the bread.
Cemita — Mexico
A sesame-topped roll associated with Puebla, filled in many ways and often including avocado, cheese, herbs and chile. The tall stack benefits from careful slicing and ingredient distribution.
Shawarma or döner in bread
Thinly sliced seasoned meat with vegetables and sauces in pita, flatbread or a roll. The key challenge is managing sauce and hot filling so the bread stays intact.
Tramezzino — Italy
Soft, crustless white bread with delicate fillings, commonly cut into triangles. It relies on restrained moisture and fine, even ingredients rather than crust strength.
Smørrebrød — Denmark
Open-faced rye bread with carefully arranged toppings. The dense base supports rich fish, meat, eggs, cheese or vegetables; open-faced construction changes the balance of bread to topping.
These are broad introductions. Regional and family versions vary, and transliteration or naming conventions may differ.