What You Need to Know
Thermal degradation of ossein (bone collagen) into gelatin, coupled with Maillard reactions between amino acids and reducing sugars in marrow. Calcium phosphate matrix remains structurally intact while organic components undergo pyrolysis.
Creates foundational umami depth for stocks, with roasted notes replacing raw meat flavors.
Key Parameters
Temperature
180°C
150°C - 220°C
Time
1.5 hours
45 minutes - 3 hours
Equipment
Heavy gauge sheet panRoasting rackChinois for fat skimming
Steps
- 1.
Tonkotsu broth (Fukuoka, Japan): Creates milky opacity through emulsified marrow
- 2.
Demi-glace (French cuisine): Builds fond for sauce base
The Science
Primary Reaction
Maillard Reaction