Combine half of the brown sugar and the pecans in a small saucepan.
Heat, over medium heat, cooking until the pecans are slightly fragrant.
Add the water and remaining brown sugar.
Stir well to dissolve the brown sugar.
Allow mixture to come to a simmer.
Reduce the heat and simmer over medium-low until reduced by half.
Remove from heat, and stir in 1/2 teaspoon vanilla extract, if using.
Strain the pecans out of the mixture before storing in a sealed container in a cool spot.
Note: The pecans can be left in the syrup is you wish. This works great when using the syrup for pancakes or baked goodies. If using the syrup in drinks, you will want to strain out the pecans.
Nutritional information is an estimate and provided as a courtesy. The values may vary according to the ingredients and tools that are used. Please use your preferred nutritional calculator for more detailed information.