Combine all ingredients in a saucepan over medium heat until simmering. Be sure to continually whisk until the sugar is dissolved. Once combined and simmering, remove from heat and let sit for 5-10 mins for the flavors to absorb. Strain and store until use.
Take a glass filled with ice and mix Wisher, pear juice, ginger ale, and ginger sage simple syrup. Garnish with a sage leaf.