Lemonstone (レモﾝストネ, Remonsutone) is a rare kind of mineral found in the Lumen Cavern. It gives off a luminous yellow light, and if crushed or broken, gives off a wonderful lemon scent. If it is pulverized into a powder, it can be used as a delicious lemon seasoning. Sadly, it seems to ONLY be found in the Lumen Cavern (a place that's hard enough to find on its own). However, after the Bishokuya Marimo uncovered the entrance to the cave, it has slowly began to circulate publically.
- The name of this ingredient is obvioulsy a semi-parody of the real-life type of stone, limestone.