1) Whisk together the brown sugar, ClearJel, and salt till thoroughly combined.
2) Melt the butter in a medium-sized saucepan; stir in the milk or half and half, sugar mixture, and corn syrup.
3) Bring to a simmer and cook gently, stirring constantly, until the sugar is dissolved and the mixture thickens slightly.
4) Remove from the heat and stir in the vanilla, flavor, coconut, and pecans.
5) Spoon topping onto cake.