Slice the mangoes and scoop the flesh out. Discard the skin and the pit.
In a mixer, puree the mangoes.
Chill the bowl and the whisk for few hours. Chilled bowl will help us with whipping the cream faster.
Add the chilled whipping cream to the chilled bowl. Whisk the cream until you get stiff peak. Its very important not to over beat the cream, otherwise the cream will curdle and butter will be separated.
Add the sweetened condensed milk and the mango puree. Using a spatula, mix until well combined
Transfer the mixture to a container and freeze for 2 hours. After two hours remove the ice cream and whisk the ice cream. You can also transfer the ice cream to a blender and puree till soft.
Transfer the mixture back to the container. Cover with plastic wrap and press gently making sure the plastic touches the ice cream. This prevents from forming ice crystals.
Freeze the ice cream for atleast 6 hours. Remove the ice cream from the freezer few minutes before serving. Serve as is or with crushed pistachio.