Preheat the oven to gas mark 3, grease and line your cake tin.
Beat the butter and sugar.
Add in the ground almonds and vanilla.
Next add the eggs one at a time.
Add the satsuma juice, polenta and baking powder.
Pour into the baking tin and bake for 50-60 minutes, test with a skewer in the centre of the cake, you want it to come out clean.
Cool on a wire rack and slice up when it is cold