Doughs & batters
tangzhong
烫种 · A pre-cooked flour paste made by heating a mixture of flour and liquid to approximately 65°C (149°F), causing rapid starch gelatinization. The resulting thick, glossy paste is incorporated into bread dough to dramatically improve moisture retention, crumb softness, and shelf life. The technique bridges Eastern Asian and classical French bread-making principles.
The formula
1 part flour : 5 parts liquid by weight (e.g., 25 g flour + 125 g liquid → ~150 g paste)
Cook to 65°C (149°F), not to a boil. This temperature ensures complete starch gelatinization without pushing into dextrinization.
Identity
- Must reach 65°C to fully gelatinize starch granules
- Consistency of thin pudding when correctly made
- Added to dough while warm or cooled—both functional
- Made from bread flour for maximum gluten potential
- Liquid can be water, milk, or combinations
Ingredients
| Base | bread flour (or all-purpose) | Bread flour preferred for higher protein; all-purpose acceptable for softer results |
| Liquid | water, whole milk, or combination | Milk adds lactose for browning and richer flavor; water-only yields crisper crust |
Method
- 1Combine flour and liquid in a heavy-bottomed saucepan. Whisk until completely smooth—no dry streaks.Prevents lumps during cooking; ensures even heat distribution and uniform gelatinization.
- 2Place over medium-low heat. Stir constantly with a spatula or wooden spoon.Continuous agitation prevents scorching on the pan bottom and ensures even cooking throughout the mixture.
- 3Heat to 65°C (149°F), watching for the mixture to thicken noticeably and the spatula to leave clear trails.65°C is the critical threshold where starch granules burst and fully gelatinize, creating maximum water-absorption capacity.
- 4Remove from heat immediately. Transfer to a bowl. Press plastic wrap directly onto the surface to prevent skin formation.Stops cooking immediately; plastic wrap prevents moisture loss and surface drying while cooling.
- 5Cool to room temperature or refrigerate until needed. Add to main dough during the mixing phase.The paste integrates better into dough when cooler, but warmth is acceptable; the pre-gelatinized starch performs its moisture-retention function regardless of temperature at addition.
Techniques that matter
Starch gelatinization control
Heating flour in liquid above 58°C causes granular swelling and amylose leaching, creating a thickener. The 65°C target ensures complete gelatinization without dextrinization, which begins above 70°C.
Continuous agitation
The mixture thickens rapidly as starch swells; constant scraping of the pan bottom prevents a scorched layer while maintaining uniform viscosity throughout.
Variations & derivatives
Milk tangzhongUniversal
Replace water with scalded or scalded-and-cooled whole milk. Adds Maillard-reactive lactose and casein proteins for deeper browning and richer flavor. Most common in Japanese milk bread (shokupan).
Yōane (汤種)Japan
The original Japanese term. Traditional method sometimes uses just flour and hot water, cooked more loosely. The term literally means 'hot seed' or 'hot starter,' reflecting its role as a preliminary to the main dough.
Tangzhong with butterModern Chinese bakeries
Some recipes add a small amount of fat (5–10% of flour weight) to the tangzhong, creating a richer paste. Extends softness but is not classical.
Used in these dishes
Substitutions
- Bread flour → All-purpose flour — Slightly lower protein; paste will be marginally softer
- Whole milk → Water — Paste will be less flavorful, crust will brown less deeply
- Tangzhong → Instant starch or commercial 'bread improver' containing modified starch — Functional equivalent but eliminates the technique's elegance and real-food simplicitychanges result
Troubleshooting
Paste is too thick and gluey
Heated above 70°C; excessive starch gelatinization and the beginning of dextrinization → Use a thermometer; stop at 65°C. If too thick, it can still be used but may make dough overly stiff.
Lumpy paste despite mixing
Heat too high before whisking smooth; uneven heating creates cooked lumps → Always whisk flour and liquid smooth before applying heat; use medium-low flame.
Bread still stales quickly
Tangzhong ratio too low; less than 15% of flour weight used as tangzhong → Ensure tangzhong contains at least 15–20% of total flour; classic ratios run 20–30%.
Scorched bottom of paste
Insufficient stirring or heat too high; starch scorches easily at the pan surface → Use heavy-bottomed pan, medium-low heat, and scrape bottom and sides continuously.