I had this once, a long time ago, at Big Bowl Restaurant. Divine. The other day I saw a recipe and gave it the good ole' homemade twirl.
Ginger Tea Syrup
Peel, slice, and bring to a simmer in 1 cup of water with 2 teaspoons of stevia one, three-inch knob of ginger. Let it simmer for 30 minutes.
Pour over ice and dilute to taste. Or add seltzer water to give it a little bubble.
If there's any left store it in the refrigerator.
I like it strong. So I used double the amount of ginger and bit more water. Let your preferences guide you more than the recipe!