Reserve one tablespoon of the water. Add brown sugar and remaining water to a saucepan over medium heat. Bring this to a low boil.
Stir together the reserved water, cornstarch, extract, and syrup in a small bowl. Drizzle this into the hot brown sugar syrup and stir to combine. Simmer, stirring occasionally, for 10 minutes, until reduced in volume to 1 cup or for thicker syrup down to ¾ cup.
Let the syrup cool and then pour it into a lidded glass jar and refrigerate. Serve it over whole wheat panckes, vegan waffles, and more.