MELT CHOCOLATE BASE Combine coffee (or espresso) powder and hot water in small bowl. Let stand until coffee dissolves, about 5 minutes. Microwave chocolate, sweetened condensed milk, and coffee mixture in bowl, stirring every 10 seconds, until chocolate is melted, about 1 minute. Stir in vanilla and salt. Let cool.
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MIX AND FREEZE With electric mixer on medium-high speed, whip cream to soft peaks, about 2 minutes. Whisk one-third of whipped cream into chocolate mixture. Fold remaining whipped cream into chocolate mixture until incorporated. Freeze in airtight container until firm, at least 6 hours or up to 2 weeks. Serve.
