灰汁 あく
aku

Noun

1. lye

Usually Written in Kana
Noun

2. harsh taste; bitter taste; alkaline taste; astringency

Usually Written in Kana
よん.煮 たせる寸前 すんぜん弱火 よわびにして、もう いち 灰汁 あく のぞきます。
yonnietataseru sunzende yowabini shite mōichido akuo torinozokimasu.
4. Just before bringing it to the boil, set to a low flame and remove the scum again.
Noun

3. scum (on a soup, broth etc.)

Usually Written in Kana
Noun

4. (excessive) self-assertiveness; strong individuality; strong idiosyncrasy

Usually Written in Kana
Related to アクが強い