Pour 100 ml of water into a saucepan and add gelatin. Stir. Put the saucepan on the fire. Cook, stirring, until the gelatin is completely dissolved. Do not let the mixture boil.
Place sour cream and cocoa in a deep bowl.
Stir cocoa and sour cream until smooth.
Add gelatin water to cocoa.
Mix the mixture until smooth.
Place the dessert mixture into portioned molds and refrigerate for 2 hours until set. Enjoy!