There is a very refreshing drink sometimes called elder flower champagne, very popular in Romania and called socata. You put in a bucket with some lemon juice and sugar then fill up with boiling water. Wait until it cools to luke warm then add the elder flowers and cover it. Stir the mixture every day and after (depending on how warm it is) three to five days you will start to see little bubbles forming. Strain the liquid and put in to 2 Litre plastic cola or other fizzy drink bottles. Then check every day and you will find the bottles become hard, because of all the gas. It is a very nice drink, served very cold it is just very mildly alcoholic even a child could drink it.
The cordial is a drink made by boiling the flowers in a lot of sugar. You would drink it by putting about 50ML in a half litre glass and filling the rest with water. It is very nice if you put the same amount of gin as cordial then fill the rest of the glass with tonic water and add a slice of lemon. It is divine drunk on a warm summer evening when the honeysuckle, elder flowers and of course the roses fill the air with the most magical fragrance.