In a non-stick pan, on medium-high heat, add in your water and sugar and let it come to a boil.
Add in your clementine slices and cook until the fruit is translucent.
Turn the heat down to medium-low heat and let the orange's sit in the syrup.
Lay a parchment paper on the counter and carefully take out each clementine slice to dry. Make sure that each slice is separated!
Right before serving, grab a bowl of sugar and coat each clementine slice and garnish it on the mousse with the plain whipped cream and orange zest!