You can buy rose geranium water online, but you may have the plant in your garden. To impart the flavour, line the cake tin with washed leaves, then peel them away from the cake after baking.
Summer berry cake with rose geranium cream
To get ahead, the un-iced sponges can be frozen for up to a month. Cool completely and wrap well before freezing, then defrost at room temperature before filling.
SERVES 12-15 PREP 40 mins plus cooling COOK 35 mins EASY V