Orange Mocha with Dark Rum and Hazelnuts
Combine the orange zest, orange juice, sugar and about 80 ml (approximately 1/3 cup) of water in a saucepan and bring to a boil. Reduce the heat and simmer for 5-10 minutes, until thickened. Remove from heat and allow to cool.
Prepare 4 mugs and add 1 teaspoon of the orange syrup to each. Top with freshly brewed mocha and stir in 1 teaspoon of dark rum and brown sugar. Beat the heavy cream with the vanilla sugar until stiff and spoon a dollop into each mug. Garnish with the ground hazelnuts and serve immediately.