Method. Preheat the oven to 180ºC, gas 4. Beat together the eggs, flour, caster sugar, butter, baking powder and lemon zest until smooth in a large mixing bowl and turn into the prepared tin. Bake in the pre-heated oven for about 40 mins, or until golden brown, shrinking away from the sides of the tin and springy to the touch. For the cake, line and grease 2 x 20cm spring form tins. Preheat the oven to 180°C/fan 160°C. Add all the ingredients to a bowl one by one then, using a handheld or stand mixer, mix everything together for 3 minutes till you have a.