Soak gelatine powder with 2 tbsp water, set aside.
Boil water with sugar and reduce heat to medium and add in the gelatine. Stir till gelatine melted and bring to boil again.
Turn off heat, add in coffee powder, stir well and lastly add in Kahlua liqueur. Then pour into moulds or cups. Leave to cool and chill to set in the refrigerator.
For topping: Mix the soya milk and kahlua liqueur together and add about 2 to 3 tablespoons of the mixture over the coffee jelly when serve.
Recipe by Anncoo Journal at https://www.anncoojournal.com/kahlua-coffee-jelly/