Recipe by Tom Douglas. The icing for this cake is not a classic fondant, but an almost transparent powdered sugar glaze flecked with rosemary leaves and lemon zest. The rosemary is blanched first, to remove some of its pungency. For a less dressy cake, you could omit the fondant. Simply brush the cake with the lemon syrup and serve with sliced fresh figs or small bunches of grapes.