While corn syrup may be used to make hard candy, it is by no means necessary. If you wish to make your own sugar candy at home, you do not need to rely on corn syrup to give hard candy its consistency.
Pour 1 cup of sugar into a pot and pour 1 cup of sugar over it. To make hard candy, you can use any 1 for 1 ratio of sugar and water.
Stick the candy thermometer into the solution so you can monitor the temperature.
Bring the sugar syrup up to a boil, bringing up to about 300 degrees Fahrenheit, stirring occasionally.
Set out a cookie sheet and cover it with wax paper.
Carefully pour a drizzle of the sugar syrup over the cookie sheet. The drizzle of sugar syrup hardens almost immediately upon contact with the air and produces sugar candy.