That cap seems to be spring mounted. It goes up and down. logically, by twistening it, it should open the thing, but I cannot say. The two halfspheres are rivetted toghether and they are not coming apart, so I would exclude the food container option. The opening would be too small.
As a matter of fact, it could be manufactured from a buckler.
My guess is that it is a liquid incense burner or boiler of some kind. Did the ottomas use liquid incenses?
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