STEP 1/4
Add sugar to whipped cream, whipping slowly enough to flow when the bowl is tilted, and dissolve the powdered gelatin in 3 tbsp cold water.
STEP 4/4
Finally, fill in the mocha mousse, flatten the top, harden for an hour in the freezer, dissolve the powder gelatin in the remaining coffee syrup, pour over the mocha mousse, and place in the freezer until the surface is hardened.