September 23rd is a Japanese national holiday known as “Ohigan”. The spring and autumn equinox, the time of year when the day and night are of equal length. It is also a time of transition, from the short days of winter to the long days of summer.
Aside from the seasonal aspect, the Ohigan also represents the transitions of human life, from the sunny summer of life to dark winter of death. Thus Ohigan is a time to remember those who have passed on, particularly our ancestors and loved ones.
時短派：芋羊羹の制作はいたって簡単。時短派は茹でるよりレンジでチンも可能。 (see video)
As long as you have a sweet and delicious sweet potato, it’s not difficult to make at home. (see video)
For those who are not so eager to make this at home, here are links to where you can get good sweet potato yokan.
The typical food prepared during Ohigan is the botamochi (ohagi) but this year, I decided to prepare this sweet potato cake called ‘imo-yokan (sweet potato gelled boxed cake)’ , also a traditional Japanese confectionery for my mother in law turned 100 years old and one of her favorite sweets.
Gelled Aduki Paste (Yokan) with Chestnuts （栗蒸し羊羹） is another variation which I make during the chestnut season.
750g (3本）Sweet Potato | サツマイモ （紅あずま）
12g Brown Sugar | 黒糖
93g White Sugar | 上白糖
9g Agar Powder | 粉寒天
200cc Water | 水
1g Salt | 塩