def METHOD_NAME(self,
                    uid: Union[UUID, str, LinkByUID, GEMDProcessSpec]
                    ) -> Iterator[IngredientSpec]:
    """
    Get ingredients to a process.
    Parameters
    ----------
    uid: Union[UUID, str, LinkByUID, GEMDProcessSpec]
        A representation of the process spec whose ingredients are to be located.
    Returns
    -------
    Iterator[IngredientSpec]
        The ingredients to the specified process.
    """
    return self._get_relation(relation='process-specs', uid=uid)