



[Sweet Potato Yokan Made with Pressed Sushi Box]
Imo-yokan, which is now eaten nationwide, was developed in 1902 by Wasuke Kobayashi, who ran a wholesale store of sweet potatoes and charcoal in Kotobuki, Taito Ward, Tokyo, to make it easier for the common people to eat the paste yokan, which was a luxury item at the time. The idea was to make yokan with sweet potatoes, and to use the kuzu sweet potatoes instead of throwing them away, and thus, it is a wagashi that has achieved upcycling. Funawa's sweet potato yokan, founded by Wasuke, has a natural flavor made from only sweet potatoes, sugar, and a small amount of salt. It continues to be widely loved by men and women of all ages.
To make sweet potato yokan, sweet potatoes are softened by steaming or boiling, then kneaded with sugar and salt while still hot, and placed in a mold to harden. You can enjoy sweet potato yokan at home by peeling and slicing sweet potatoes into rounds, steaming them in Yamaichi's Chinese Seiro, mashing them with a spatula, mixing them with sugar and salt, straining them, and pressing them in the Pressed Sushi Box lined with plastic wrap. If you refrigerate it well for at least an hour, it will become more moist.
Using the Pressed Sushi Box, you can fill the sweet potatoes tightly without gaps and cut them into beautiful rectangles. If you cut along the slits, it will divide into eight equal portions that are easy to eat, making it a great treat for a large number of guests. Place it on your favorite bowl and enjoy it with a nice cup of tea.
Ingredients (*For one Pressed Sushi Box):
720g of peeled sweet potato
100-120g of sugar
A pinch of salt
How to make:
Peel the sweet potatoes and cut them into 1cm slices.
Place the peeled sweet potatoes in a bowl of water and let them sit for about 15 minutes. (To prevent discoloration and to remove lye)
When the water comes to a boil, place the sweet potatoes wrapped in a cloth in the Chinese Seiro and steam over medium heat for 20 to 30 minutes until the sweet potatoes are soft.
Remove the mixture from the bowl while it is still hot, mash it with a spatula, and then strain it or put it in a food processor to make it smooth. Add salt and sugar and knead further. If you want to enjoy the texture of the potatoes, you can skip the straining step.
Place 4 into the Pressed Sushi Box with plastic wrap and press down on the mold to prevent air from entering.
Place a heavy stone or rubber band on top of the mold and refrigerate for at least one hour.
Use a knife to cut along the slits.
Yamaichi's Pressed Sushi Box
https://www.shokunin.com/en/yamaichi/oshi.html
Yamaichi's Chinese Seiro
https://www.shokunin.com/en/yamaichi/seiro.html
Nakamura Douki's Dantsuki Pot
https://www.shokunin.com/en/nakamuradouki/seiro.html
Kiya's Steamer Cloth S
https://www.shokunin.com/en/kiya/fukashi.html
Adachi Shigehisa Shoten's Uragoshi (Strainer)
https://www.shokunin.com/en/adachi/uragoshi.html
Appi Urushi Studio's Tsubaki Plate
https://www.shokunin.com/en/appi/plate.html
Miyamoto Shoko's Japanese Cocktail Stick
https://www.shokunin.com/en/miyamoto/wayouji.html
References
https://ja.wikipedia.org/wiki/%E8%8A%8B%E7%BE%8A%E7%BE%B9
https://www.chintai.net/news/2020/10/02/94989/ (Recipe)