Preheat your oven to 180°C (350°F). Grease a 20cm round cake pan and line the bottom with parchment paper to prevent sticking.
Sift together the flour, cocoa powder, baking soda, and salt in a large bowl until evenly combined and light in texture.
In another bowl, whisk the eggs, buttermilk, vegetable oil, vinegar, and vanilla extract until the mixture is smooth and slightly frothy.
Add the red food coloring to the wet mixture and stir until the color is evenly distributed, creating a vibrant crimson hue.
Gradually pour the wet ingredients into the dry mixture, folding gently with a spatula or mixing on low speed until just combined and the batter is glossy and smooth—avoid overmixing to keep it light.
Pour the batter into your prepared cake pan, spreading it evenly with a spatula to ensure a flat, smooth surface.
Bake in the preheated oven for about 30 minutes, or until the edges just start to pull away from the pan. Insert a toothpick into the center; if it comes out clean, the cake is ready.
Remove the cake from the oven and let it cool in the pan for 10 minutes, then transfer to a cooling rack to cool completely—this helps prevent sogginess.
Once cooled, the cake is ready to be frosted with tangy cream cheese frosting and decorated as desired for a stunning presentation.