Preheat oven to 350
For the cake: Melt butter over low heat and stir in cocoa until smooth
Whisk in water and remove from heat.
To the warm cocoa mixture add sugar, mascarpone, vanilla and eggs. Whisk until smooth.
In another bowl combine flour, baking soda and salt. Add dry ingredients all at once to wet ingredients, stirring with a spatula until incorporated. Once incorporated use whisk to mix just until smooth.
Stir in cherry pie filling
Grease 10" bundt pan with cooking spray and use a pastry brush to make sure all areas are covered. Sprinkle pan with sugar, turning and patting until all surfaces are covered. Do this just before pouring batter into pan.
Pour batter into prepared pan and smooth evenly.
Bake in center of preheated oven 1 hour, or until firm to the touch and edges are just starting to pull away from the sides of the pan.
Cool in pan on wire rack 20 minutes
Loosen cake carefully with a knife and invert onto wire rack to cool completely
Make the glaze: Place chocolate chips in bowl and set aside.
In small saucepan combine cream, corn syrup, and espresso and heat just until boiling. Take off of heat, stir in vanilla and pour over chocolate chips. Stir and let sit 1 minute. Whisk until it comes together in a smooth pourable glaze.
With cake still on wire rack place a plate underneath (large enough to catch drips) and spoon glaze over cake letting it drip down sides and onto plate. Once all of the glaze has been used, replace first plate with another plate and start spooning glaze from the first plate back over the cake.
Let stand until glaze is set and carefully transfer from rack onto serving plate. Garnish with Luxardo cherries, if desired.