In a small bowl, combine unflavored gelatin powder and cold water. Mix together and set aside for about 5-10 minutes, until it becomes solid and jelly-like.
In a mixing bowl or in the bowl of a stand mixer fitted with the whisk attachment, combine sweetened condensed milk and cold heavy cream. Mix on medium speed for about 2-3 minutes, until soft peaks form. Add in the mascarpone and continue to mix for about 1-2 minutes, until combined and smooth stiff peaks form.
Pour in the mango puree and lemon juice and mix until just combined.
Place the gelatin mixture into the microwave for about 10 seconds, until it liquifies, and then pour into the mango mixture. Then return to mixing together until stiff peaks form. Be careful not to overmix, this should only take 1-3 minutes.
Place into serving glasses and eat immediately or refrigerate for 4 hours, until firm. Garnish with fresh berries, mango cubes, and/or fresh mint.
Notes
Chill your mixing bowl and cream, cold cream whips up faster and holds more air for a light, fluffy mousse.I know that many of my recipes call for room temperature ingredients - however, this is not one of them! We want everything to be cold.
Be careful not to overmix your whipped cream. When stiff peaks form, stop. It's ready to fold into the mango mixture.
Serve immediately or set in the refrigerator for a more thickened traditional mousse-like texture.
I prefer to use kesar mango puree, however, you can use fresh mango puree too by cutting up ripe juicy mangoes and adding them to a food processor and blending until smooth.