A flakey pastry baked in the shape of a flattish biscuit.
Sandmelons are one of the few fruits native to Motavia and are noted for their unusual size (considering they're a desert plant).
They naturally tend to grow near underground springs and oases. The husk of the fruit is very thick and cannot be opened without a large knife or object of equal mass and sharpness, but the pulp inside is very gooey and refreshing. Even though it is not very sweet, sandmelon pulp easily lends itself as fruit filling for baked goods. On Motavia the cakes are often used as "birthday food".
(a minor note, the taste and texture of sandmelon cakes are modeled off of the Chinese wintermelon cakes)