Pour water into a saucepan and bring to a boil on a stovetop burner.
Once the water comes to a boil, turn the heat down to a medium simmer and add herbs. Stir well to completely saturate the herbs.
Using the handle of a wooden spoon, submerge it into the saucepan mixture and then remove it. Note the waterline. (See video.)
Using kitchen twine, tie a piece of the twine at the halfway point of the waterline. Set aside.
Allow the water and herb mixture to decrease by half. This can take approximately 15 minutes. Use the wooden spoon with the twine to measure the halfway evaporation. (See video.)
Once the mixture has decreased by half, place a mesh strainer over a bowl and strain the herbs from the liquid.
If there is significant herbal debris in the liquid, re-strain it one more time by lining a mesh strainer with a flour sack towel, cheesecloth, or coffee filters. Pour the liquid through the lined mesh strainer placed over a bowl.
Now, it is time to sweeten the liquid. There are two ways to do this.
Sweetener Option 1 - If you are using a liquid sweetener, such as honey or maple syrup, you will simply add the desired amount to the warm liquid in the bowl and stir well until the sweetener has completely dissolved.
Sweetener Option 2 - If you are using a granulated sweetener like sucanat, maple sugar, or white sugar, you will need to pour the liquid into a clean saucepan placed on a stovetop burner and then add the desired sweetener to the liquid in the saucepan. Turn the stovetop burner to low and stir the mixture until the granulated sweetener has completely dissolved.
Once sweetened, the herbal syrup is ready to be decanted. If possible, decant this syrup into an amber-colored glass bottle and then refrigerate it. This herbal syrup will stay potent for approximately one year.
The dosage depends on what type of herbal syrup you made and what symptoms you are experiencing. Consult an authoritative source for more information on this topic, including any book written by Rosemary Gladstar. Also, see the Recipe Notes below for additional information.