Add the sugar and water to the saucepan and stir to combine.
Place the saucepan on the stovetop on high heat and bring the mixture to a boil.
Once it starts to boil, reduce the heat to medium high and let it gently boil for about 3 minutes.
Remove the saucepan from the heat and place it on a trivet or cooling rack.
Add the fresh sage leaves to the hot syrup mixture.
Cover the saucepan with a lid or towel and let it cool to room temperature.
Set up your storage bottle with a funnel to pour through. Once the syrup is cool, carefully pour the syrup through both the strainer and the funnel into the bottle.
You can use the syrup right away, or store it in the refrigerator for about a month. Discard at any sign of mold.
Notes
If you would like to reduce the sugar in this syrup, I suggest substituting allulose because it has the best flavor in a sugar substitute. You can substitute 225 grams (1 ⅛ cup) allulose for 200 grams (1 cup) sugar.