This is a tart made from the sweet potato "Mitsuhime" from Tanegashima, Kagoshima Prefecture. Mitsuhime is said to be the "ultimate sweet potato" that seeks "highest quality" among the Anno potatoes known for their high sugar content.
The custard cream using Mitsuhime is put in the tart dough and baked, and the jam and paste are layered and baked twice to make it fragrant and flavorful.
In addition, it seems that you can eat deliciously even if you heat it in the microwave. Estimated heating time is 25 seconds at 500w.