Chicken Nanban (Japanese Fried Chicken, 44g Protein)

Chicken nanban is the Japanese diner classic where fried chicken gets dunked in a sweet and sour soy glaze, then buried under a cold chunky tartar sauce. This version keeps all of that and lands at 44 grams of protein per serving by leaning on chicken thigh and swapping most of the mayo in the tartar for nonfat Greek yogurt.
The trick that makes it work as a real recipe and not a sad diet swap is that the tartar still has real chopped egg, pickle and a little mayo, so it tastes like tartar and not like seasoned yogurt. You fry the chicken properly, coat it in the vinegar sauce while it is hot, then spoon the cold sauce on at the end.
It plates like a treat and eats like a meal-prep staple. Forty minutes start to finish, most of it hands off while the chicken marinates.
Why this works
Potato starch is the coating I reach for on anything Japanese fried. It fries up glassier and stays crisp longer than flour, which matters here because the chicken is about to meet a wet sauce. Dredge thin and press it on, a thick cakey layer just falls off in the vinegar bath.
Coating the chicken in the nanban sauce the second it leaves the oil is the whole point of the dish. Hot crust drinks in the vinegar and soy, so the flavor goes into the chicken instead of pooling on the plate. Dunk and lift, do not let it soak, or the crunch is gone.
Ingredient notes
Chicken thigh is worth it over breast here. It stays juicy through frying and the fat balances the sharp vinegar, and boneless skinless thigh still brings plenty of protein. If you only have breast, cut it thinner and pull it at 160F so it does not dry out.
Nonfat Greek yogurt does the heavy lifting in the tartar. It carries the tang and the body while cutting most of the fat and calories a full mayo version would add. Keep the 2 tablespoons of real mayo though, that small amount is what keeps the texture and flavor honest. Rinsing and squeezing the minced onion takes out the raw bite so it does not overpower the sauce.
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Tips and storage
For meal prep, store the components apart. The fried chicken keeps 3 days in the fridge, the tartar keeps 4, and the nanban sauce keeps a week. Reheat the chicken in a 400F oven or air fryer for 6 to 8 minutes to bring back the crust, then sauce and top just before eating. Assembled and stored, the crust goes soft overnight, so I never sauce ahead.
To stretch the protein further, serve it the way a Japanese teishoku set would, over rice with shredded cabbage, or alongside a bowl of miso. If you like this Japanese fried chicken, the same starch-and-shallow-fry method drives my air fryer chicken katsu, and the yogurt-boosted creamy sauce is the same idea behind ebi mayo. For a no-fry Japanese chicken night, oyakodon is the move.