Have ready 6 serving glasses or cups, about 120 ml (1/2 cup) each.

Pour aquafaba into mixing bowl, or the bowl of a stand mixer, and set aside.

Place the chocolate in a double boiler and heat until just melted.

Pour into another mixing bowl and allow to cool for a few minutes.

Whisk the aquafaba, salt, and cream of tartar for 2 to 3 minutes forming soft peaks.

Gently stir a third of the aquafaba into the melted chocolate, until fully incorporated.

Fold in the remaining aquafaba in two additions, using a spatula and lifting the mixture in a circular up-and-down motion to avoid deflating it, until fully incorporated.

Pour into the cups, level the surface with the spatula, and sprinkle with cacao nibs.

Transfer to the fridge, and allow to set for at least 2 hours before serving.