Gather the ingredients.

Combine coffee, sugar, and coffee liqueur in a bowl with a whisk until sugar dissolves.

Pour mixture into an 8x12- or 9x13-inch dish. Freeze, uncovered, until it just starts to get slushy around the outside, about 1 hour and 15 minutes.

Take a fork and break the frozen pieces up, stirring into the liquid. Crush any large pieces with the back of the fork.

Return to the freezer and repeat the process every 30 minutes until you’ve reached your desired consistency, about 4 to 5 times total.

Serve immediately or return to the freezer and chill for 8 hours, or overnight, before serving for best results.