peel and segment the mandarin. With the back of the spoon, remove the white pith.
In a bullet blender - blend up the mandarin fruit and peel - into a slushy pulp. Make sure there are not big bits, try to get it as smooth as possible.
Now, spoon in the Jamaican black castor oil. Mix well to combine.
And then pour in the brown sugar and mix. Some of the grains will melt, but you should still feel enough of a grit to get a good scrub. Test with your fingers. If not, add in more brown sugar.
To use: Get in the shower and wet your hair. Turn off the water and scrub your scalp. Then let it sit for five minutes, rinse off and shampoo and condition as normal.