noun
straw-wrapped natto
A traditional type of natto wrapped in a straw bundle (苞). Often contrasted with わら納豆 (wara nattō), which is wrapped in straw as well but may refer to a slightly different preparation or regional name.
See also: わら納豆 (わらなっとう)
つと納豆は、昔ながらの製法で作られた納豆です。
Tsuto natto is natto made using a traditional method.
この地方では、苞納豆が名物として売られている。
In this region, straw-wrapped natto is sold as a local specialty.
Both refer to natto wrapped in straw. 苞納豆 specifically uses a 苞 (tsuto), a straw bundle, while わら納豆 is a broader term for straw-wrapped natto. In practice, they are often used interchangeably, but 苞納豆 may emphasize the traditional wrapping method.
Compound of 苞 (tsuto, 'straw bundle') + 納豆 (nattō, 'fermented soybeans'). The exact historical origin is uncertain, but it refers to a traditional preservation and fermentation method using straw wrappers.