秘ひ伝でん

noun, noun which may take the genitive case particle 'no'

secret; mystery; esoteric knowledge

Refers to a closely guarded secret, especially a recipe, technique, or tradition passed down within a family, school, or art. Often used in compounds like 秘伝のたれ (secret sauce).

• この店みせのラーメンは秘ひ伝でんのスープが決きめ手てだ。

  The secret soup is the key to this shop's ramen.

• 師し匠しょうから秘ひ伝でんの技わざを教おそわった。

  I learned a secret technique from my master.