What world leader once trained as a pastry chef under arguably the most famous chef in the world?

Well Dorian,
I think it was Ho Chi Minh that trained as a pastry chef at the London Carlton in the early 1920s under Auguste Escoffier
Ho Chi Minh later went on to become president of North Vietnam.

Uncle Ho it is! Some site give Paris as the location of his training, but Escoffier was in London at the time Ho trained.

With the advent of World War I, Ho went to live in London, where he worked as a snow shoveler and as a cook's helper under Escoffier, the master chef, at the Carlton Hotel. Escoffier, it is said, promoted Ho to a job in the pastry kitchen and wanted to teach him the art of cuisine. - Mishalov.com