Blend mangoes to smooth puree
Add dates or palm jaggery or stevia or maple syrup. Sweetner can be of your choice. The quantity required will depend on sweetness of mango too
Blend mangoes with sweetner. Add egg yolks and blend again for few seconds
Mix cornstarch with 1/4 cup milk until lump free. You can use coconut milk too incase of dairy allergy
Now add cornstarch paste to mango mix and blend until well combined. check and adjust the sweetness of the mango mix as per desired taste since the sweetness will reduce once all ingredients are mixed so adjust the sweetness now
Heat remaining milk in saucepan over low heat. Do not boil
Now gradually add the mango mix to saucepan and mix well until lump free. Do not add mango puree mixture at once
Over low - medium heat, keep stirring the custard until it starts thickening
Allow custard to cool to room temperature
Pour the custard in serving bowls. Cover and refrigerate for 1-2 hours
Garnish custard with chopped mangoes, fresh mint sprigs or as desired. Serve cold