Preheat oven to 180°C. Line a 22cm round cake pan with non-stick baking paper. Combine 2 1/2 cups (375g) self-raising flour, 1 cup (220g) caster sugar and 1/2 cup (90g) cornmeal (polenta) in a large bowl.

Add 250g butter, melted, 1 orange, rind grated and juiced, 3 eggs and 1/2 cup (125) sour cream. Stir until well combined. Spoon into pan and smooth the surface. Bake for 50-55 minutes or until a skewer comes out clean.

Heat 1 cup (330g) orange breakfast marmalade and 3 tbs orange juice in a saucepan over a medium heat until runny. Pour over cake and serve with double cream.