Plant for dishes

Hi, in Peru Amazon jungle there are still some native that uses these dishes made with this plant. Anyone know the scientific name of the plant? Do you know about other options of plants that can be used as dishes?

By the way,  inside the bowl it became dark as you can see in the second picture. It looks like dirty, is there is a way of avoiding this? Do you think it would be a good idea using resina poliester these one?

A picture of the leaf would help to ID the leaf.

The leaves of a palm is commonly used.

Here are some threads about using leaves to wrap things and for plates and bowls:

https://permies.com/t/175493/tree-leaves-wrap-cheese

https://permies.com/t/55061/University-develops-leak-proof-food

I could not see your picture until after I posted.

that looks like a coconut shell that has been sanded to me.

i’m guessing it’s the calabash tree, Crescentia cujete. i would stay away from polyester resins on food surfaces.