Position a rack in the lower third of an oven and preheat to 325 degrees F. Generously
grease and flour a 6-well Bundtlette pan.
To make the cakes, over a sheet of wax paper, sift together the flour, baking
powder and salt. Set aside.
In the bowl of an electric mixer fitted with the flat beater, beat the butter
on medium speed until creamy and smooth, 1 to 2 minutes.
Add the sugar and beat
until light and fluffy, about 5 minutes, stopping the mixer occasionally to scrape
down the sides of the bowl.
Gradually add the eggs, beating well after each addition.
Beat in the lemon oil. Reduce the speed to low and add the flour mixture in three
additions, blending each addition until just incorporated. Stop the mixer occasionally
to scrape down the sides of the bowl.
Spoon the batter into the prepared pan and spread evenly.
Bake until a wooden pick inserted near the center of a cake comes out clean,
about 20 minutes.
Transfer the pan to a wire rack and let the cakes cool upright
in the pan for 10 minutes, then gently tap the pan on a work surface to loosen the
Set the rack over a sheet of wax paper and carefully invert the cakes onto
To make the glaze, split the vanilla bean in half lengthwise and scrape the seeds
into a small saucepan.
Add the water, sugar, honey and butter. Heat over low heat
just until the sugar dissolves.
Increase the heat to medium and cook for 5 minutes.