Mix the dried elderberries, water, and fresh ginger in a medium saucepan, turn the pan on low-medium, and heat until it begins to simmer.
Simmer this for 20 - 30 minutes, checking carefully to ensure it doesn't boil too hard or the water doesn't boil away. Add a bit of extra water if you need to.
When the syrup is cooked, allow it to cool for a while. Then, strain the syrup through a sieve. You should end up with around 2 cups of juice.
Discard the berries and ginger. Allow the mixture to cool to lukewarm. Add the honey.
Add the lemon juice before stirring to combine completely. Pour it into a glass jar for storage and put it in the fridge. Your elderberry syrup is finished!