Add the eggs one at a time, allowing to fully combine between each addition
Add the clemantine zest and mix.
By hand sift the flour and the baking powder over the mix and fold it in to combine
Sprinkle around 1/2 - 1 teaspoon of brown sugar in the the bottom of each cavity of a greased muffin pan.
Add a slice of clementine (cut about 1cm thick) on top of the sugar.
Using an ice-cream scoop, evenly measure out the cake batter and dollop onto each clementine (about 3/4 of the way up the pan).
Bake for 25 - 30 mins, until golden brown.
Make the syrup by bringing the juice and sugar to the boil until the sugar has dissolved and it just starts to thicken.
Using a spatula gently loosen the baked cakes from the mould and tip out onto a cooling rack. Pour the warm syrup over the cakes to allow them to absorb.
Notes
They are perfect to serve just as they are, or you could add a dollop of fresh cream.