Whisk together flour, salt, sugar, baking powder, baking soda, buttermilk, eggs, butter, vanilla, 1/2 cup coconut flakes, lime zest and lime juice until well-combined.
In a medium dry skillet, toast coconut over medium low heat. Remove from heat and allow to cool.
Spray waffle iron with non-stick cooking spray and portion into waffle iron to cook according to waffle iron instructions. Remove from waffle iron and top with toasted coconut for serving.