Wash the currants and dab dry. Melt butter and lard at low heat. Stir in sugar and currants. Leave to cool a little.
Chop the candied lemon peel and candied orange peel finely, chop half of the walnut kernels coarsely. Stir everything with lemon peel into the fat. Mix flour, baking powder and spices, also stir in. Finally add eggs, honey, wine and milk and mix everything to a smooth dough.
Cover and leave to rest for 4-5 hours at room temperature.
Grease the spring plate (approx. 30 cm Ø) and dust with flour. Smooth the dough in the form. Cover with candied fruit and remaining walnut kernels. Bake in the preheated oven (electric cooker: 175 °C/circulating air: 150 °C/gas: level 2) for 25-30 minutes.
Switch the temperature down (electric oven: 150 °C/circulating air: 125 °C/gas: stage 1) and continue baking for 20-25 minutes. Leave to cool in the mould. Dust with icing sugar.