Dissolve coffee powder in 1 tablespoon warm water. Put condensed milk in a bowl, add coffee.
Put heavy cream in the bowl of your mixer. Whip cream until firm peaks form.
Fold the condensed milk into the whipped cream until well combined. Add pinch of salt and ground cacao nibs and fold until evenly incorporated.
Transfer into a freezer-proof container; cover and chill for at least 4 hours.