It's not unaju ... It's "pig weight"! At Sankotei, a hidden restaurant in Gotanda--Lunch is limited to 15 meals a day
Recently, I'm addicted to "Butaju", not Unaju or Tendon. The Butaju sold at Gotanda "Sankotei" is a dish where you can fully enjoy the mariage of meat and sweet and spicy sauce without any extra greasy taste.