Chop the macadamia nuts and roast them in a pan until golden brown. Remove, put 50 g aside for decoration. Mix flour, baking powder, salt, 50 g sugar and orange zest in a bowl. Whisk eggs and buttermilk. Add the egg mixture and oil to the flour mixture and whisk briefly with the whisk of the hand mixer to a smooth dough.
Mix in the nuts. Grease a muffin tin (12 wells) well and dust with flour. Spread the dough with a tablespoon. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for 25-35 minutes. Leave to cool in the tin for about 10 minutes. Remove the muffins from the tin and let them cool down on a cake rack. Caramelise 75 g sugar in a pan until golden. Remove from the heat, add the set aside nuts and turn in the caramel. Spread on a piece of aluminium foil lightly coated with oil. Mix icing sugar with mulled wine to a smooth, thick icing.
Caramelise 75 g sugar in a pan until golden. Remove from the heat, add the set aside nuts and turn in the caramel. Spread on a piece of aluminium foil lightly coated with oil. Mix icing sugar with mulled wine to a smooth, thick icing. Spread the icing on the muffins with a tablespoon of the icing. Sprinkle with purple sugar immediately and decorate with caramel nuts. Allow to dry
1 hour waiting time