Time: 15 minutes, plus 2 to 3 hours freezing
3 cups freshly brewed strong coffee
1/2 cup sugar, or to taste
1 tablespoon cocoa powder, optional
1. Stir coffee, sugar and cocoa together; taste and add more sugar if necessary.
2. Pour mixture into shallow metal or glass pan or bowl. Freeze about 30 minutes, or until ice crystals begin to form at the edges. Gently stir the crystals back into the liquid, not breaking them up entirely.
3. Continue to stir and break up clumps of crystals every half-hour or so. When the entire mixture has the texture of soft crushed ice, it's ready to serve.