Simple 5 ingredient old-fashioned caramel apple recipe.
Mix sugar, corn syrup 1 cup of the cream in a large bowl. Once the mixture is smooth and well combined pour into a large heavy sauce pan. Add the butter. Cook over medium/low heat until mixture begins to boil. Wash the sides of the pan with a wet pastry brush, if sugar crystals are present. Stir constantly. When butter has melted and mixture has come to a rolling boil, slowly add remaining cream trying not to let the mixture stop boiling.
Clip on a candy thermometer, turn heat to low. Stir constantly and cook until caramel reaches 234F. Drop a small amount of the hot caramel into a bowl of cold water. If you can pick up the caramel and form a soft ball the caramel is finished.