The extra cocoa solids in chocolate ice cream can make it freeze harder than other flavor. A quick zap in the microwave for 15 or 20 seconds can soften it up, or you can place it on the counter for 20 minutes before serving. Another option is to add a tablespoon of clear vodka to the ice cream mixture before freezing. Because vodka does not freeze, it can help keep the ice cream from getting so hard.