(If mixture becomes too thick to brush on, microwave it for about 10 seconds, or until warm and softened.)
FOR CAKE
Preheat the oven to 325 degrees
In the bowl of a stand mixer, combine all the cake ingredients. Use the paddle attachment and mix on low speed until the dry ingredients are moistened, about 2 minutes (an electric hand mixer will work as well).
Increase the speed to medium and beat for 3 minutes.
Bake for 60 – 75 minutes until a cake tester inserted in the center comes out clean. Remove the cake from the oven and prick the cake all over, with a long wooden skewer.
FOR THE BUTTER SAUCE
About 5 minutes before the cake is done combine the sugar, water and butter in a medium saucepan and heat until the butter melts and sugar dissolves.
Remove the pan from the heat and stir in the vanilla.
ASSEMBLY
Use a long skewer to poke at least 30 holes into the bottom of the cake.
Pour ¾ cup of the butter sauce all over the exposed portion of the hot cake.
Let it cool in the pan for 10 minutes and then invert cake onto a serving platter.
Spoon, pour, or brush the remaining sauce over the cake.
Allow the cake to cool for 1 hour before serving.
However, if you love warm cake, go ahead and dig in.
The cake is great by itself, but also tastes great with whipped cream or ice cream.
Notes
Buttermilk substitute: Use 1 tbsp of lemon juice or white vinegar, then pour milk on top to make 1 cup.
DO NOT USE THE IMAGES as a proper visual for the glaze. It's too thick in the images.