Refrigerate the custard mixture for at least 30 minutes or till use.
Once custard cooled add mango puree and flavor to it, chill for 30 minutes.
In a chilled bowl using wire beater, whip the heavy cream to soft peaks.
Now add the chill mango puree and custard mixture.
Gradually whip for another couple more minutes until you see traces in the whipping mango ice cream mixture.
Store in an air tight container and freeze overnight or at least for 6 hours before serving.