Preheat your oven to 170°C (325°F). Grease and line a 9-inch round cake tin or prepare cupcake liners.
Beat together the eggs and dark brown soft sugar until fluffy. Gradually add sunflower oil, continuing to beat.
Sift together flour, mixed spice, and bicarbonate of soda. Fold this into the egg mixture.
Stir in the grated carrots, orange zest, sultanas, coconut, and pecan nuts until well combined.
Pour the mixture into the prepared tin or divide into cupcake liners. Bake for 45-50 minutes for the cake (20-25 minutes for cupcakes) or until a skewer inserted comes out clean.
For the icing, mix together mascarpone, cinnamon, milk (or orange juice), and sugar until smooth.
For the syrup glaze, dissolve the sugar in orange and lemon juice over low heat. Brush over the warm cake.
Once cool, spread the icing and sprinkle with toasted pecan nuts.