Dou Ru Ji
豆乳雞·(dòu rǔ jī)
便當 (Biàndang) - The Taiwanese Bento Box for School and Office
A square glass jar of fermented bean curd sits in the fridge door of almost every Taiwanese kitchen. Born in the rugged mud-volcano hills of Kaohsiung before conquering Ruifeng Night Market, Dou Ru Ji skips the twenty-spice dredge for a few humble cubes of Taiwanese white fermented bean curd mashed with garlic and sugar. Those enzyme-rich cubes tenderize dark meat from the inside out and pack a wallop of umami into boneless chicken thighs that standard soy sauce can only dream of. Dredged in coarse sweet potato starch and left to hydrate before the edges blister in the hot oil, the crust stays shatteringly crisp even hours later at room temperature—making that little jar the undisputed heavyweight champion of the school biàndang box.
Before you start
Mash the fermented bean curd cubes and their brine in a large bowl with a fork until a smooth paste forms.
Eliminate all lumps now so the chicken marinates evenly without pockets of intense saltiness.
Whisk the garlic paste, soy sauce, Michiu, sugar, white pepper, five-spice powder, and egg into the bean curd paste.
Go easy on the five-spice; a tiny pinch adds background warmth, while too much makes the chicken taste like braised pork.
Add the chicken pieces and massage thoroughly until evenly coated, then cover and refrigerate for at least 1 hour or overnight.
The natural enzymes in the fermented bean curd need time to break down the muscle fibers and tenderize the meat.
Spread the sweet potato starch in a wide shallow bowl and dredge the chicken a few pieces at a time, pressing firmly so the starch adheres.
Shake off the excess starch and arrange the chicken on a wire rack to rest undisturbed for 10 to 15 minutes.
This grandmother secret is called fan chao (returning moisture). Waiting until the dry white starch absorbs the marinade and turns tacky ensures the crust bonds to the meat instead of falling off in the hot oil.
Ingredients
- boneless skin-on chicken thighs1 1/2 lb
- Taiwanese white fermented bean curd3 cubes
- garlic3 small cloves
- soy sauce1 tbsp
- Michiu or dry sherry1 tbsp
- granulated sugar1 1/2 tbsp
- ground white pepper1/2 tsp
- five-spice powder1/8 tsp
- egg1 large
- coarse sweet potato starch or tapioca starch1 1/2 cup
- neutral oil2 cup
Method
- 01
Heat the oil in a heavy Dutch oven or wok over medium heat until it reaches 320°F.
If you don't have a thermometer, stick a wooden chopstick into the oil; a steady stream of small bubbles should rise immediately around the wood.
- 02
Fry the chicken in batches for 3 to 4 minutes until pale golden and cooked through, then transfer to a wire rack.
Do not crowd the pot. Because fermented bean curd and sugar burn easily, this moderate first fry cooks the dark meat gently without scorching the marinade.
- 03
Raise the heat and bring the oil temperature up to 375°F.
- 04
Return all the chicken to the hot oil and flash-fry for 30 to 45 seconds until deeply golden brown and audibly crisp.
This traditional double-fry technique, known as qiang su (snatching the crisp), violently blasts absorbed oil out of the starch and locks in a crunch that survives for hours.
- 05
Drain on the wire rack and cool completely before packing into bento boxes, or serve hot.
Never pack warm fried chicken into a closed lunchbox; trapped steam is the enemy of a good crust.
Notes
Buy white fermented bean curd, never red.
Taiwanese Dou Ru Ji relies on pale white bean curd (bai doufuru), which is sweet, mild, and often fermented with rice wine or sesame oil. Do not buy Cantonese red bean curd (nan ru), which will turn your chicken bright red and make it taste like roast pork.
Use the air fryer on busy weeknights.
Preheat the air fryer to 320°F. Arrange the rested, starch-coated chicken in a single layer and spray generously with neutral cooking oil until no dry white powdery spots remain. Air-fry for 8 minutes, flip, spray any dry spots, and crank the heat to 390°F for 4 to 5 minutes until golden and crisp.
Swap in tapioca starch if you can't find coarse sweet potato starch.
Available in the baking aisle of almost any standard American supermarket, tapioca starch is botanically and functionally nearly identical, delivering that same light, craggy, resilient crust.