A voluptuously moist French pastry-shop chocolate gateau, Queen of Sheba cake has just enough structure to qualify as cake, but otherwise could pass for a chocolate truffle for 12. A shiny glaze doubles down on the chocolate, making sure that no part of your palate escapes the wave of deep dark flavor. Prepare for a totally immersive chocolate experience. Julia Child wrote that Reine de Saba (Queen of Sheba) was the first French cake she ever ate, and she devoted her 100th show of The French Chef to this recipe way back in December 1965. First aired on WGBH-TV in Boston, this seminal cooking series went nationwide, catapulting Julia to culinary icon, and then…