Place the 2 1/2T. water in a small bowl. Then add in the gelatin and stir to combine. Let sit 5 mins.
(IT will seem like rubber.)
Whisk cocoa and water together in a saucepan.
Slowly add cream and sugar: Gently mix with a rubber spatula, not a whisk.
Turn stove to medium high and heat this to a boil stirring gently.
Once boiling, remove heat and add in the gelatin-stir slowly to dissolve it.
Pour this through a trainer into a glass bowl to remove air bubbles.
Press plastic wrap on surface and cool about 2 hours until 86 degrees.
Strain it once more at this point.
Place the cake on a cooling rack over a jellyroll pan to catch the excess glaze.
Pour glaze on top of your chilled cake.
Let set and enjoy!
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