Wash oranges hot and rub dry. From 1/2 orange with a julienne chewer, tighten the peel spirally. Rub off the remaining peel. Cut oranges in half and squeeze the juice. Let the orange juice boil down to half in a small pot
Separate eggs. Briefly whisk 40 g sugar and egg yolks with the whisk of the hand mixer. Stir in jam, orange juice and zest. Beat the egg whites until stiff, then add 40 g sugar. Mix almonds, starch and baking powder. First fold in beaten egg whites, then almonds
Grease the bottom of a springform pan (22 cm Ø). Pour in the mixture and bake in a preheated oven (electric range: 175 °C/ convection oven: 150 °C/ gas: level 2) for 25-30 minutes. If the surface becomes too dark, cover with aluminium foil
Remove the cake from the oven, remove from the edge and spread with liqueur. Dust the cake with icing sugar before serving and decorate with the orange spiral
Waiting time approx. 1 hour