Ingredients
Method
1.Cover unpeeled whole oranges in medium saucepan with cold water, bring to the boil. Boil, uncovered, 30 minutes; drain. Repeat process with fresh water, boil about 1 hour or until oranges are tender; drain. Cool oranges.
2.Preheat oven to 200°C/180°C fan-forced. Grease deep 22cm-round cake pan; line base and side with baking paper.
3.Blend or process nuts with 1 tablespoon of the sugar until coarse.
4.Trim ends from oranges then cut in half; discard seeds. Blend or process oranges, including rind, with baking powder until mixture is pulpy.
5.Beat eggs with remaining sugar in small bowl with electric mixer until light and fluffy. Transfer to large bowl; fold in nut mixture, almond meal, polenta, butter and orange pulp. Spread mixture into pan.
6.Bake cake about 50 minutes. Cool in pan 5 minutes; turn, top-side up, onto serving plate; serve dusted with sifted icing sugar, if you like.