Parboil rice with water and sugar till water evaporates . it should be sticky.
Add milk & few drops of vanilla essence in a mixer jar with rice and make coarse paste. Keep this rice mixture aside .
To make crepe : Mix flour, cocoa powder , sugar , a pinch of baking powder , water and make a thin batter . Heat tawa and grease with oil . Now make thin crepe with lightly cooked on both sides.
Ready all crepes like this.
Place cling film on a plate. First place crepe.
Arrange medium thin layer rice mixture on it . Dip your fingers in water to avoid sticking. Arrange mango slices on rice now.
Now Roll cling film carefully But tightly with the help of hands . Now keep in fridge for an hour . Cut afterwards carefully with a very sharp knife.
Serve immediately.