Who is Shankerbai in 'Going solo' by Roald Dahl?

In Roald Dahl's "Going Solo," Shankerbai is Roald Dahl's cook while he worked for the Shell Oil Company in Africa. She is described as a talented cook who prepared delicious Indian dishes for Dahl and his colleagues. Dahl speaks fondly of Shankerbai and credits her with teaching him about Indian cuisine and culture.