In the field of machinery, a structure of two exterior parts stuck together horizontally or vertically is referred to as 'monaka structure' supposing that the experior parts are the thin crispy wafers and the internal machinery is the bean jam.
機械等において、2枚の外装を左右あるいは上下に貼り合わせた構造を、外装を皮に、内部機構を餡に見立てて「モナカ構造」という。