The Confection Hoop is a treasure found in Pikmin 2 that is actually a baumkuchen cake. It is found on the 2nd sublevel of the Submerged Castle. It is the 41th treasure on the List of Pikmin 2 treasures.
Captain Olimar's Journal
"The hole we searched today was filled with a saccharine scent. Just sniffing it put me at risk of developing a cavity. Ugh... I don't think I can eat anything sweet for a while. Wait... Who am I kidding?"
"This sugary delight has even a machine like me wishing to partake in its deliciousness! What a sweet-looking circlet!"