Line a baking sheet with parchment paper and set aside. Place the sugar, water, and corn syrup in a saucepan.
3 cups white granulated sugar, 1 cup plus 2 tablespoons water, ¾ cup corn syrup
Add the black food dye.
black food coloring
Heat over medium-high and stir the mixture to combine.
Place the candy thermometer in the pan and continue heating until the mixture reaches 290° Fahrenheit (about 8-10 minutes).
Wash the apples and remove the stems. Dry with a paper towel, then push a wooden stick all the way down into the center of each apple.
6 Granny Smith Apples
Once the candy coating reaches 290° Fahrenheit, remove it from the heat. Add the salt and vanilla extract and stir.
¾ teaspoon salt, 1 teaspoon vanilla extract
Dip each apple into the saucepan. Swirl a couple times to get a thick, dark black coating. Lift and let the excess drip off.
Place the apple on the parchment covered baking sheet then repeat with the rest of the apples and let them cool until hardened.
Notes
Work quickly when dipping the apples, as the candy coating hardens quickly. If it does start to harden, you can put it back on the heat and stir until it softens up.