Stock:Tare:Fat Golden Ratio & Umami Synergy Multiplier (USM)
60–70% stock, 15–20% tare, 10–15% fat emulsion is the synergy sweet spot. USM = 1.0 + 0.15×min(Glu,Ino)/100. Both Glu+Ino above 90 → USM=1.35.
- ▸7h tonkotsu: Brix +2.1° / +12 emulsion / 80% collagen gelatinized (95°C×4h)
- ▸Kombu 60°C 60min: Glu +22 / Brix +0.8° / 100°C 48h+ fat cap → Aroma -15
- ▸15ml tare in bowl bottom — dumping into stockpot costs Emulsion -0.18
- ▸Hold 86–92°C: Emulsion(T)=1.0 / <85°C=0.62 / >95°C=0.88
- ▸Calculator workflow: ① pick stock ② tare ③ noodle ④ temp slider → live Umami/Aroma/ROI