Photo: Daniela Eftimova · CC BY-SA 4.0
Tea Egg (Marbled Egg Steeped in Tea and Soy)
Boiled eggs cracked but not peeled, then steeped for hours in black tea, soy and five spice. The shell works as a mask: the liquid gets in only where the shell is broken. Peel one at the end and the pattern on the white is an exact map of where you tapped it. The tea is not there for flavour so much as for its tannins, which bind to protein — they firm the outer layer of the white and are what makes the brown.
Ingredients
- The eggs
- eggs · a few days old; very fresh ones cling to the shell and the pattern tears8
- The steeping liquid
- black tea · black or pu-erh; green tea has less tannin and turns bitter fast4 tbsp
- water1 L
- soy sauce100 ml
- dark soy sauce · optional, for a deeper colour1 tbsp
- sugar2 tbsp
- salt1 tbsp
- Spices
- star anise3
- cassia bark1 piece
- Sichuan pepper1 tsp
- cloves4
- dried tangerine peel · chenpi, if you have it1 piece
- dried chillies · optional2
Steps
- ⏲ 9 min
Lower the eggs into boiling water and cook them nine minutes. Starting in cold water makes the timing unrepeatable (cooking eggs). Straight into cold water afterwards.
- ⏲ 10 min
When they are cool, tap them all over with the back of a spoon until the shell is finely crazed but still holding together. What you tap is what you get: tap closely for a fine web, a few times for bold lines.
- ⏲ 5 min
Bring a litre of water to the boil with the tea, soy, sugar, salt and spices and let it infuse five minutes, then lift the tea leaves out. Longer and too much tannin comes out and it turns astringent.
- ⏲ 30 min
Put the cracked eggs into the liquid and hold it at the barest heat for thirty minutes. Do not let it boil — egg white sets at 62C, and above 80C the proteins contract hard and squeeze water out, which is rubber (cooking eggs).
- ⏲ 233 min 20 sec
Take it off the heat and let it cool in the liquid. Four hours at least; overnight is best. Most of the colour and the seasoning go in during this time.
- ⏲ 5 min
Reheat them in the liquid to serve, or eat them as they are. Peel them just before eating — peeled ahead, the marbled lines dry out and bleed.
Tips & Variations
Variations
- Peeled before steeping: no marbling, but the colour and seasoning go in far more evenly and faster. Most Taiwanese convenience-store eggs are made this way.
- Lu dan (滷蛋): braised in soy and spices with no tea at all. This is the egg on Taiwanese lu rou fan, which is on this site.
- Iron eggs (鐵蛋): steeped and dried over and over for days until they are small, almost black and chewy. A speciality of Tamsui, and a completely different texture.
- Quail eggs in the same liquid need about twenty minutes.
- Reusing the liquid: shops keep topping theirs up. At home, strained and refrigerated, it is good for two or three more batches.
Tips
- The shell is a mask. This is the only dish on the site that uses a shell as a resist. Liquid gets in only where it is broken, and the thin membrane under the shell is a second barrier — which is why it takes hours rather than minutes.
- It is the exact counterpart of oden. There the egg is peeled before it goes into the dashi, so colour goes into the whole surface evenly. Here the shell stays on, so it goes in only along the cracks. The same operation with and without a mask.
- The tea is in it for the tannin. Tannins bind to protein: they firm the outer layer of the white and are what make the brown. Hence black or pu-erh tea rather than green, and hence the five-minute infusion — steeped longer, the surface goes tough and astringent.
- Never let it boil. As cooking eggs puts it, above 80C the proteins contract hard and squeeze water out. A tea egg boiled for hours is rubber. Thirty minutes at the barest heat, then off it.
- Avoid very fresh eggs. The same guide notes that they peel badly because the white clings to the membrane. Usually that is a minor annoyance; here a torn white takes the whole pattern with it.
- How you tap it is the design. A few firm taps give bold lines; light tapping all over gives a fine web. Where a piece of shell falls off altogether, that patch comes out solid brown rather than patterned.
- Overnight beats half a day by a lot. The colour arrives in a few hours, but salt needs time to reach the yolk.
The basics behind this dish
- Eggs: Coagulation Temperatures and What They DecideWhite sets at 62°C, yolk at 68°C. Those two numbers explain scrambled eggs, boiled eggs, steamed custard and crème anglaise all at once.
- Deep Frying: Temperature, Batter, and the Second FryFrying is not cooking in oil so much as trading the food's water for it. Two temperatures, what each kind of coating is for, and why the second fry exists.
- Heat Control: Preheating, Oil, and Reading the PanThe same ingredients become a different dish depending on pan temperature. When to add the oil, how to read heat by sound, and which dishes want low heat instead.
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