Gather the ingredients.
In a small bowl, combine the gelatin powder and water.
Place the brewed coffee and sugar in a medium saucepan and bring to a near boil over medium-high heat.
Turn off the heat, and whisk in the gelatin mixture until it dissolves. Set aside to cool, about 10 to 15 minutes.
Pour the coffee gelatin mixture into a shallow baking dish (8- or 9-inch square or 11 x 7 inches) and refrigerate until set, about 5 hours.
Once the coffee jelly has set, cut the gelatin into ½-inch cubes.
Spoon the cubes into individual serving dishes and top with whipped cream , if desired.
