Beat the cream cheese, butter and lemon rind together until smooth, add the sugar, beat again until light and fluffy. Beat in the eggs one at a time, stir in the sifted flour in two batches, then beat lightly until smooth. Spoon into a well greased and floured 20 cm ring or baba tin.
Bake in moderate oven (350°F) for 30 minutes, reduce temperature to moderately slow (275°to 300°F), and bake for another 30 minutes. Cool in the tin for 10 minutes, then turn onto a wire rack to cool.
When cold, melt the lemon glaze ingredients together and pour over cake.