Step 1: Pre-heat the oven to 180C/350F/Gas 4. Grease an 18cm/7in round cake tin, line the base with greaseproof paper and grease the paper.

Step 2: Cream the butter and sugar together in a bowl until pale and fluffy. Beat in the eggs, one at a time, beating the mixture well between each one and adding a tablespoon of the flour with the last egg to prevent the mixture curdling.

Step 3: Sift the flour and gently fold in, with enough milk to give a mixture that falls slowly from the spoon. Fold in the lemon zest.

Step 4: Spoon the mixture into the prepared tin and lightly level the top. Bake on the middle shelf of the oven for 30-40 minutes, or until golden-brown on top and a skewer inserted into the centre comes out clean.

Step 5: Remove from the oven and set aside to cool in the tin for 10 minutes, then turn it out on to a wire rack and leave to cool completely.

Step 6: To serve, decorate the cake with the candied peel.