Place pan on medium-high heat, and cook, stirring until the sugar is completely dissolved. Bring the syrup to a boil, cover the pan and boil the syrup for 3 minutes.
Remove the lid. Dip the brush in the water and brush down the sides of the pan. Attach the candy thermometer inside the pan. Cook the syrup, without stirring, but occasionally swirling the pan, about 10 to 12 minutes or until the thermometer reads 236 to 238 degrees, frequently brushing the sides of the pan with the damp brush.
Remove the thermometer. Turn the heat off from under the pan and swirl in the butter and vanilla extract. Remove the pan from the stove and set the pan on a wire rack.
Cool the fudge in the pan for 2 to 3 minutes. Stir in the coconut and immediately pour the fudge into the buttered pan, taking care not to scrape the bottom of the pan, which may be sugary. Cool candy completely, at least several hours, and then mark in 1-inch squares. Remove the candy from the pan, place on a chopping board and cut into pieces.
Nutrition information per serving:
Calories67Fat2 gSodium13 mg