Peel the cardamom. Finely crush the pimento and cardamom grains in a mortar. Cut figs, plums and walnuts a little smaller. Mix figs, plums, nuts, spices and brown sugar. Pour 150 ml of hot water and brandy over the mixture and cover and leave to stand overnight. Mix flour, buckwheat flour, baking powder and salt. Whisk eggs.
Mix marinated fruits in the liquid, flour mixture and eggs in a large bowl with a wooden spoon. Pour the dough into a greased box form (20 cm long) and smooth it down. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for approx. 45 minutes. Remove, let cool for 5 minutes and turn out onto a cake rack. Let the cake cool down. Mix sugar and lemon juice. Spread the icing on the cake and decorate with fresh figs