Sealed crustless sandwich
A sealed crustless sandwich consists of a filling between two layers of crimp-sealed bread, with the crust removed. Homemade variations are typically square, round, or triangular; the bread can vary, e.g., white or whole wheat; and the sandwiches can be homemade with common crimping techniques similar to pie crust, ravioli, or dumplings using readily available kitchen tools (e.g., a fork, small spoon or curved knife end to crimp the edges).
Source: Wikipedia — Sealed crustless sandwich (CC BY-SA 4.0)