Tsukudani is a Japanese simmered dish flavored with soy sauce and sugar, and so on. There are many kinds of tsukudani, and the most popular kind is made from kombu and is called kombu no tsukudani. When you have leftover kombu from making dashi broth, try making tsukudani. Tsukudani is usually very salty, and it's good to eat on hot steamed rice.
Cut leftover kombu into thin strips. Put kombu, sake, and rice vinegar in a small pan. Pour some water enough to cover kombu. Bring to a boil and simmer kombu on low heat until softened. Add soy sauce and sugar. Simmer until liquid is gone. Stop the heat. Mix white sesame seeds in.