What You Need to Know
Blanching removes surface impurities, while a high‑heat char of onions and ginger generates 2‑alkenals that add sweet‑smoky notes. Simmering at 90–95 °C hydrolyzes collagen to gelatin and releases amino acids, and a brief spice infusion at 80–85 °C extracts terpenes without volatilizing essential oils. Final clarification with egg whites or gelatin removes residual fat for a silky, translucent broth.
Steps
- 1.
Pho Bac (Hanoi-style) (Northern Vietnam): Creates crystal-clear broth with pronounced star anise/cinnamon notes
- 2.
Bun Bo Hue (Central Vietnam): Adapted with lemongrass charring for more pungent aroma
- 3.
Taiwanese Beef Noodle Soup (Taiwan): Hybrid technique incorporating soy sauce and tomato paste
The Science
Primary Reaction
collagen hydrolysis (gelatinization) combined with Maillard browning and terpene extraction