Candy apples have been a Halloween staple for many years. William W. Kolb, a Newark, N.J., confectioner, tried dipping apples in a candy syrup and discovered just how tasty they were when the shells hardened. The treat is easy to make and is a project that you can do with children.
Spray a baking sheet with nonstick cooking spray and set aside.
Wash the apples and place them on paper towels to dry. Remove the stem of each apple and insert a wooden stick in its place.
Combine sugar, corn syrup and water in a small saucepan. Heat over medium heat, stirring, until the sugar dissolves.
Attach the candy thermometer to the pot and bring the mixture to a boil. Cook over medium-high heat until the mixture reaches 300 degrees F. Remove the pot from the heat and mix in the food coloring.
Dip each apple into the syrup, hold it over the pot until the excess drips from it, and then place it on the baking sheet to cool and harden. Store red candy apples in an airtight container for up to three days.