Offal smells strong because of blood and surface fat. Both come off with one hot bath.
Blood proteins turn to scum when heated. Surface fat carries most of the smell. Boiling for ten minutes lifts both to the top. The offal itself keeps its own good flavor.
Japanese motsu shops boil, drain, wash, and boil again. Two rounds are standard. The second water stays almost clear.
The first boil pulls out most of the blood. Scum sticks to the surface as you drain. Washing under running water takes that off.
Add ginger and green onion to the second boil, not the first. In the first pot they just get thrown away.
I skipped the wash between boils once. The pot smelled fine. The finished stew did not.
| ❌ Symptom | 🔍 Cause | 💡 Solution |
|---|---|---|
| The stew smells of the animal | Only one boil | Boil, wash, and boil again |
| Grey scum keeps rising | The offal was not washed | Rinse under running water between boils |
| The offal is tough | The simmer was too hot | Keep the pot just below a boil |
