Add the elderberries, water, ginger, clove, and cinnamon to a medium saucepan with a lid.
Bring the mixture to a simmer over medium heat, stirring often.
Once the berries start to simmer, reduce the heat to low and place the lid on the pot, leaving it slightly ajar so that steam can escape.
Allow the berries to cook over low heat until the liquid level is reduced by about half, or approximately 20-35 minutes.
Once the liquid level has reduced by half, remove the berries from the heat and strain them by lining a colander with cheesecloth and setting it over a large bowl.
Press the solids to extract any remaining juice and compost anything that remains in the cheesecloth.
Transfer the liquid to a measuring cup, taking note of its volume.
Measure an equal amount of honey (so if you have 2 cups of elderberry juice, measure out 2 cups of honey).
Add the elderberry juice into a large bowl, along with an equivalent amount of honey. Stir well until the honey is fully incorporated.
Allow the elderberry syrup to cool to room temperature, then cover with plastic wrap and place in the fridge to chill.
Once the elderberry syrup has chilled for about 4-12 hours, transfer it into clean jars for storage.
Store in the fridge for 4-12 weeks, discarding if there are any signs of spoilage.
Take 1-2 teaspoons per day during cold and flu season, or 1-2 tablespoons several times per day if not feeling well.