01 -
Preheat oven to 175°C. Line cupcake pan with paper liners and set aside.
02 -
In a large bowl or stand mixer fitted with the whisk attachment, combine flour, cocoa powder, malt powder, sugar, instant coffee, baking soda, baking powder, and salt. Add eggs, buttermilk, melted butter, and vanilla, and beat on medium speed until mixture is fully combined, about 2 minutes. Carefully pour in boiling water and mix until batter is smooth.
03 -
Fill each cupcake liner two-thirds full with batter. Bake for 18 to 22 minutes, until a toothpick inserted in the center emerges clean. Transfer cupcakes to a wire rack and allow to cool completely before decorating.
04 -
Line a baking sheet with foil. In a small saucepan over medium-high heat, combine corn syrup, sugar, cream of tartar, and water. Stir until mixture comes to a boil. Cease stirring and affix a candy thermometer to the pan. Using a wet brush, wash down any sugar crystals from the sides. Continue cooking until temperature reaches 150°C, then immediately pour the hot candy syrup onto the prepared baking sheet. Allow to set for at least 1 hour before breaking into shards.
05 -
Pipe buttercream frosting generously onto the cooled cupcakes. Insert glass candy shards into the center of each. Drizzle red food coloring gel over the surface to achieve a blood drip effect.