Peel and slice the fresh ginger into thin discs. About 1/8 inch thick.
Place the dried elderberries, filtered water, cinnamon, and ginger into the slow cooker.
Cook for 8 hours on low.
Strain the cooked berries, water and ginger through a fine mesh strainer into a medium sized bowl. Use the back of a spoon to squeeze out the juice from the berries.
Once the liquid has cooled down and is warm to the touch, add in the honey and mix thoroughly until smooth and dissolved well.
I like to add 1/4 cup of honey per 1 cup of elderberry juice. Feel free to add more honey if you'd like it sweeter. I personally prefer it less sweet.
Pour into a glass jar and store in the refrigerator for 2-3 weeks.
Notes
Be sure to add the honey when the liquid has cooled or is just slightly warm. Hot water will kill the beneficial nutrients in the honey. I take 2 teaspoons daily to prevent sickness, and 2 tablespoons when I'm sick - but my immune system is weak due to autoimmune disease. I recommend 1 teaspoon a day if you're a normally healthy person, and 1 tablespoon if you're sick. I give my kids 1/2 teaspoon daily, and up to 1 1/2 teaspoons when they're sick.