In a medium saucepan, add your chopped pecans. Toast over medium heat for 3–5 minutes, stirring frequently, until fragrant. This step gives the syrup its signature toasted-nut depth — don’t skip it!
To the toasted pecans, add in the granulated sugar, brown sugar, water, and salt, and bring the mixture to a simmer. Simmer for 10 minutes to allow the flavors to infuse, and to thicken the syrup mixture.
Pour the syrup through a fine mesh strainer to separate the chopped pecans. (set aside the chopped pecans, don't throw them away!!)
While the syrup is still warm, stir in the caramel extract, vanilla extract, and brown butter extract.
Let the syrup cool completely before adding a lid and storing in the fridge for up to 3 weeks.