Step 1

Whip aquafaba and cream of tartar in a standing mixer or Vitamix.  I mean whip the dickens out of it, until the aquafaba stands in stiff peaks like meringue.  This may take up to 10 minutes.

Step 2

Spoon the whipped aquafaba into a separate bowl and pop in the fridge to keep it cool and light.

Step 3

Now whip together the mango, sweetened condensed coconut milk, rum and lime juice for a minute or two, just until smooth.

Step 4

Gently fold the aquafaba into the mango mixture and voila, you have magic mango mousse.  Spoon into dessert cups and let chill for at least an hour.

Step 5

Best enjoyed within 3 days.