Tenshinhan (Crab Omelette on Rice under a Starch-Thickened Sauce)
A Japanese-Chinese dish: a soft crab omelette slid onto rice and covered with a sweet-and-sour sauce thickened with starch. The fact that heat moves poorly through a thick liquid is, in a pot, an obstacle that dictates the order of cooking; on the plate it is the design. The sauce lies over the egg and rice like a lid and keeps them hot.
Ingredients
- Omelette (2 servings, one each)
- eggs4
- crab meat · crab sticks work too80 g
- spring onion · sliced on the diagonal1
- shiitake mushrooms · thinly sliced, optional2
- salt1 pinch
- neutral oil3 tbsp
- hot cooked rice2 bowls
- Ankake sauce
- chicken stock200 ml
- soy sauce1 tbsp
- sugar1.5 tbsp
- ketchup1 tbsp
- potato starch · slaked in 2 tbsp water1 tbsp
- rice vinegar1.5 tbsp
- green peas · to garnish1 tbsp
Steps
Pack the rice into two bowls in a mound. The omelette will sit on it like a dome.
- ⏲ 30 sec
In a small pan bring the stock, soy, sugar and ketchup to the boil. Lower the heat, stir in the slaked starch and cook 30 seconds until glossy and thick; only then add the vinegar and take it off the heat.
Beat the eggs with the crab, spring onion, shiitake and salt, just enough to break up the whites.
- ⏲ 20 sec
Heat half the oil in a pan or wok over high heat until it just smokes. Pour in half the egg and push it from the edge to the centre two or three times in large folds. After 20 seconds, set outside and still runny inside, tilt the pan to gather it into a round.
Slide it onto the rice. Make the second omelette the same way.
Bring the sauce back just to the boil, pour it over the egg all at once, scatter the peas and serve.
Tips & Variations
Variations
- Kansai style: no ketchup or vinegar — a clear ankake of stock with soy or just salt, golden rather than red. The sweet-and-sour red sauce in the photograph is the more common one in the Kanto region.
- Kanitama: the same omelette and sauce without the rice, served as a side dish.
- Tenshindon: another name for the same thing, putting the rice bowl (donburi) first.
- With crab sticks: at home it is usually crab sticks, which are a fish paste of the kamaboko kind shaped and coloured like crab leg.
- About the name: Tenshin is the Japanese reading of Tianjin in China, but the dish was made in Japan.
Tips
- What is an obstacle in the pot is the design on the plate. Pasta e fagioli says "Heat does not move through a thick broth the way it moves through water", which is why it wants a short pasta shape, and curry rice puts its roux in last for the same reason: "Reverse the order and convection stops". In both it is a property to be worked around inside a pot. Tenshinhan uses the same property on the plate. A thin sauce keeps circulating and carries its heat up to the surface, where it is lost; a starch-thickened sauce hardly moves, so the layer lying over the egg and rice holds its heat through the meal.
- Which is why the sauce goes on last, and all at once. To work as a lid it has to cover the whole omelette in one pour; ladled on bit by bit, the first part has cooled before the last arrives.
- The vinegar goes in after the sauce has thickened. Thickening sauces explains: "Vinegar or tomato cuts the starch chains, so acidic sauces need more starch" — and advises adding the acid after the thickening has set. Orange chicken says "This sauce is acidic all the way through, and the thickening guide's advice cannot be followed." because there the acid is the sauce. Here it is a tablespoon and a half and can wait, so the guide's order is followed. Adding it off the heat also keeps more of its sharpness.
- Why potato starch. The same guide says "a stir-fry eaten immediately wants potato starch". This sauce is poured the moment it is made. Reheated after standing it goes looser, so make the sauce first and reheat it once only.
- Take the egg out while the middle still runs. Under a layer of hot sauce it keeps cooking on the plate. Cooked through in the pan, it turns tough under the sauce.
The basics behind this dish
- Browning and the Maillard ReactionMeat fails to brown for one of three reasons: it is wet, the pan is cool, or you put too much in at once. Plus how the brown film stuck to the pan becomes your sauce.
- Cooking Meat: Temperature, Resting, and Cutting Against the GrainDoneness is a core temperature, not a number of minutes. What resting actually does, how to handle a thick cut, and why the direction you slice changes the texture.
- Knife Skills: Grip, Cuts, and Why Size MattersHow you hold the knife matters more than how fast you cut. The pinch grip, the claw hand, and why uniform size is a cooking decision rather than a cosmetic one.
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