Preheat your oven to 350°F (175°C).
In a bowl, mix together the flour, cocoa powder, and baking soda.
In another large bowl, cream together the sugar and butter until light and fluffy.
Add the eggs one at a time, mixing well after each addition.
Mix in the buttermilk and vanilla extract until smooth.
Gradually combine the dry ingredients with the wet mixture, mixing until just combined.
Add red food coloring until the desired color is achieved.
Pour the batter into a greased springform pan and smooth the top.
Bake the cheesecake for about 60 minutes, or until the edges are set but the center still jiggles slightly.
Once baked, turn off the oven and allow the cheesecake to cool in the oven with the door slightly ajar for an hour.
Chill the cheesecake in the refrigerator for at least 4 hours, preferably overnight, before serving.
Top with whipped cream, chocolate shavings, or sprinkles for decoration just before serving.