... madeira cake ... 240g butter at room temperature 200g caster sugar 1 unwaxed lemon 3 large eggs ( about 60g ) 300g flour 00 12g of baking powder 1 - Preheat the oven to 170 ° C . 2 - In the planetary beat the softened butter with the sugar . 3 - Add the eggs one at a time , alternating with a tablespoon of flour. 4 - Add the remaining flour , baking powder and finally the zest and juice of the lemon. 5 - Pour the mixture into buttered mold and bake for about 60 minutes.