Place a clean cloth over a strainer and put it on top of a bowl.
Pour in the yogurt and close the cloth with a rubber band or a clothespin.
Let it strain overnight, or at least 4 hours, in the refrigerator.
Add the frozen mango to a blender, together with the previously strained yogurt, turmeric, salt, and maple syrup.
Blend everything and put it in a box with a lid.
Place in the freezer for at least 4 hours.
Melt the chocolate bar in a bain-marie (i.e., hot water bath).
When melted, let it cool slightly so that it thickens, and transfer it to a bowl.
Dip the top part of the waffle cones in the chocolate, to get the chocolate strip and let it sit in a glass.
Take the ice cream out of the freezer and cut several "slices". It's best to wait a bit so that it thaws slightly and is easier to slice.
Take it back to the blender or to the food processor and grind it again.
Add the fresh mango pieces and mix well.
Serve immediately in the waffle cones with chocolate or place in the freezer.