Dissolve the water and agar powder in a saucepan and soak for about 10 minutes. Place drained canned chestnuts on bottom of mold. Remove the red bean paste to room temperature beforehand.

Bring agar to a boil, stirring, and when it boils, melt for a minute or so. Then add sugar and starch syrup and melt, stirring well. Add red bean paste and stir well over low heat to dissolve.

When the red bean paste is completely melted, stir and boil until slightly thickened. Pour into the prepared mold and stir with chopsticks to remove bubbles. Hit the floor with red bean filling during the night. Let it harden in a cool place for more than an hour. I cooled it down and left it in the refrigerator overnight.

Cut the well-dried red bean jelly into bite-size pieces.

I put it in a box with a sticker on it, so it would be great to give it as a gift. If you use that amount, it comes out to about 16, but I think you can increase the amount to fit the size of the box. I don't think it'll be pretty even if it's too low, so it's pretty even if you don't put it in a box or wrap it in plastic and put a sticker on it. Then I hope you have a good day today