Solar Cooker
The Solar Cooker looks like a chest and can cook food with sunlight.
Shining Block of Diamond
A Shining Block of Diamond can be placed above a Solar Cooker to use it independently of the sun.
Reflectors since 1.21
Since 1.21: Up to 2 Reflectors can speed up the Solar cooker when placed into the Solar Cooker.
Interface
Instead of having a fuel slot, there is a sun symbol. The Solar Cooker needs sunlight to work.