Make the Sponge Cake:
Preheat your oven to 180 °C (350 °F).
In a mixing bowl, beat the egg whites until stiff peaks form.
Gradually add the sugar while continuing to beat until glossy.
Incorporate the egg yolks and mix until well combined.
Gently fold in the sifted flour, whole milk, and vanilla extract in three parts using a folding motion.
Pour the batter into a greased cake pan and bake for about 30 minutes.
Prepare the Creamy Flan:
While the cake is baking, blend together the condensed milk, evaporated milk, cream cheese, eggs, and vanilla extract until smooth.
Add the hydrated Grenetina into the mixture and blend until fully incorporated.
Once the sponge cake has finished baking, pour the flan mixture into the same cake pan (make sure it’s lined with aluminum foil for easy removal).
Bake for an additional 40 minutes until the flan is set and firm.
Make the Celestial Syrup:
Blend all the syrup ingredients together until smooth.
Once the cake is done, pour the syrup over the cake, and refrigerate it overnight to allow the cake to absorb the flavors.
Magic Assembly:
Once chilled, cut and serve the cake in layers, alternating between sponge cake, whipped cream, and flan, possibly topping with more whipped cream as desired.