くろからしじゃなかったです
黒芥子じゃなかったです
kurokarashijanakattadesu

Noun
Desu Copula

The polite, past negative form of くろがらし

1. Wasn't black mustard.; Wasn't black sesame.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana