煮込 にこんじゃう
nikonja u

Godan Verb (mu)
Godan Verb (u)

The completive aspect (contracted form) - indicates completion or regret of 煮込む

1. To stew/simmer (and it's done); To overcook/stew too much; (Expressing regret for stewing/overcooking)

Completed Action
Colloquial