Pick the elderflower on a dry sunny day, choosing those that smell lemony and fresh. For the rose petals, pick them from red or pink roses for the colour.
For long-term storage, the cordial can be frozen.
To drink, dilute to taste with cold water (still or sparkling). It can also be made with hot water to encourage sweating in colds and fevers.
The cordial can be frozen to make a sorbet or popped into possible moulds to make ice lollies. Extra rose petals can be added to make the colour brighter.
