Pick through the dried elderberries and remove any twigs or unripe berries.
Add elderberries, 4 cups water, cinnamon sticks, ginger and cardamom to a large pot and heat over medium heat.
Once it has reached a boil continue to cook, uncovered, for 45 minutes. Occasionally check to make sure the water has not reduced past the point of the berries. If this happens add a cup of water at a time until the entire cooking time has finished.
Strain the elderberries and then measure the remaining liquid. You should have about 2 cups. If you have less than two cups add some more cold filtered water until it is 2 cups. If you have more than two cups continue to boil until it has reduced to 2 cups.
While hot add the honey and whisk to combine. We used 1 cup of honey, but if you tend to like things more sweet use the full 1-1/2 cup amount.
Store in a jar in the refrigerator.