Pour the chickpea liquid into the bowl of a stand mixer. Use the whisk attachment to beat mixture on high until soft peaks form. Add in sugar and cream of tartar and whisk until stiff peaks form.
Melt the dark chocolate chips in the microwave or over a double boiler. Pour in canned coconut milk and stir to combine.
Pour the chocolate mixture into the whipped chickpea meringue and fold to combine.
Divide mixture between 4 (1-cup) jars and refrigerate for 2-4 hours to set.
Serve mousse with coconut whipped cream, fresh raspberries, and chocolate shavings. Enjoy!