My friend Michelle Eshkeri, of the Lavender Bakery, who used to work at Konditor & Cook, showed me how to make these. Do not on any account buy the powdered icing sugar known as fondant icing sugar (it doesn’t work and will not cover the cake sufficiently). Use a packet of white or pouring fondant icing instead (but do not confuse this with ready-to-roll fondant icing). I’