This version has gin and elderflower liqueur instead of simple syrup.
gin
elderflower liqueur
lemon juice
soda water
garnish:
lemon or orange slice
cherry
Elderflower liqueur is made from the flower of certain species of elder (Sambucus nigra). The berries of elder bushes can also be used in jams and jellies.
Elderflower liqueur
"Your father smells of elderberries!” is an insult because elderberries can also be used to make wine.
Layering cocktails
You can layer cocktails with ingredients with different specific gravity. In the Elderflower Collins, gin is less dense than elderflower liqueur, and lemon juice. So it floats.
Related Recipes
Use Empress Gin for its beautiful purple color. Elderflower liqueur would be a great substitution in this gimlet shown here.