Homemade "the best" Caramel

Harshma posts on Allrecipes.com the exact recipe that my family has used for years...the only difference is that I add chopped walnuts at the end....I put mine in the freezer after till ready to give out..or more likely snack on...

Ingredients:
1 cup butter or margarine
1 pound light brown sugar
1 (14 ounce) can sweetened condensed
milk
1 cup light corn syrup
1 pinch salt
1 1/2 teaspoons vanilla extract
Directions:
1.
In a heavy bottomed saucepan over medium heat, combine the butter, brown sugar, sweetened condensed milk, corn syrup and salt. Bring to a boil, stirring constantly. Heat to between 234 and 240 degrees F (112 to 116 degrees C), or until a small amount of syrup dropped into cold water forms a soft ball that flattens when removed from the water and placed on a flat surface. Cook for 2 minutes at that temperature. Remove from the heat and stir in vanilla.
2.
Meanwhile, butter a 9x13 inch baking pan. When the caramel is ready, pour into the buttered pan. Allow to cool completely at room temperature. Remove from the pan and cut into squares using scissors. Wrap individual pieces in waxed paper or cellophane.