You can find “Tsukugen Tanaka-ya”, a Tsukuda-ni (food boiled down in soy) store in Chuo-ku, Tokyo, by approx. an 8-minute walk from Tsukishima Station. A shop for selling and a factory adjoin each other, with a floating scent of salty-sweet soy sauce of tsukuda-ni.
The good flavor, not too sweet, not too salty, is popular amongst a wide range of people. Their tsukuda-ni is deliberately cooked in the secret sauce continuously replenished, well-flavored for everyone to love. It is very popular as a souvenir or gift.
In summer season, you can find this special tsukuda-ni using seasonal Anago (conger). Their Anago is baked once, then cooked in the sauce, ending up with grilled soft taste. It is a must-buy item when you find it.