• Preheat oven to 350°F (180°C).
• Grease and flour two 9-inch (23 cm) round cake pans, and line the bottoms with parchment paper circles to prevent sticking.

Make the Cake Layers:

• In a small bowl, whisk together the soy milk and apple cider vinegar. Let sit for 5–10 minutes until curdled.
• In a large mixing bowl, whisk together the cane sugar, flour, cocoa powder, baking powder, baking soda and sea salt. Add the soy milk mixture, applesauce, oil, and vanilla extract.
• Mix boiling water and instant coffee in a small bowl until dissolved. Immediately pour into the batter.
• Using an electric mixer, beat the batter on medium speed for 2 minutes until fully combined. Scrape down the sides and stir once more by hand to ensure everything is incorporated.
• Divide the batter evenly between the two prepared pans.
• Bake for 27 minutes, or until a toothpick inserted in the center comes out clean.
• Let cakes cool in the pans on a wire rack for 30–60 minutes.
• Run a butter knife around the edges, then carefully turn out and let them cool completely on the wire rack.

Frost and Decorate:

• Tint most of the frosting light pink (use beet powder or plant-based pink food coloring).
• Reserve a small portion of frosting and color it green for piping the message.
• Place one cake layer on a serving plate or cake stand.
• Add a layer of pink frosting over the first cake.
• Top with the second cake layer and apply a layer of pink frosting over the top and sides. Don’t worry about it being smooth—it should look like the homemade cake Hagrid gave Harry.
• Use a piping bag with a small round tip (or a ziplock bag with a snipped corner) filled with green frosting to write: "Happee Birthdae Harry"