Brew 2 cups strong coffee
Add 2 to 4 tablespoons sugar, if desired
Sprinkle 2 tablespoons unflavored gelatin over 1/4 cup cold water
Let the gelatin bloom for 5 minutes
Heat the coffee until hot, not boiling
Stir the bloomed gelatin into the hot coffee until fully dissolved
Pour the mixture into a shallow dish or mold
Refrigerate for 3 to 4 hours, or until set
Cut the jelly into cubes
Serve with milk, cream, or sweetened syrup if desired