Remove 1/2 tsp of the cream cheese icing and place in a small bowl/ramekin. Add the black cocoa powder and red food colouring and stir well to combine.
Fit the piping bag with the #124 petal tip. Use a skewer (or the blunt edge of a dinner knife) to smear the burgundy icing all the way down the seam of the bag, on the same side as the thinner end of the tip.
Being careful not to smear the burgundy icing already in the bag, fill the piping bag with the white icing. Pipe a little icing back into your bowl, until you see the burgundy colour come through along the top.
Hold your cupcake in your non-dominant hand (alternatively, place the cupcake on a non-stick mat, on top of a turntable). Hold the piping bag in your dominant hand, ensuring that the petal tip is vertical, with the thicker end facing the bottom (the line of burgundy icing should be on top).
Pipe a cone in the centre of the cupcake. Work your way out, adding petals around that centre cone, gradually increasing the size of each petal, while decreasing the angle between the tip and the cake's surface, as you go. Wipe the tip off in between each petal. By the time you reach the edge of the cake, your piping tip should be close to horizontal.
Repeat the process for all of the cupcakes. Because of the cream cheese icing, these cupcakes will need to be stored in the fridge, where they will stay fresh for 2-3 days.