1/4 cup Karo corn syrup, light
1 cup sugar
1/2 cup water
1 teaspoon peppermint extract
10 marshmallows
3 cups walnut or pecans

Combine corn syrup, sugar, and water in a saucepan. Cook over medium heat, stirring constantly, until mixture comes to a boil.Continue cooking to soft ball stage, about 238° on a candy thermometer, or until a small amount of mixture forms a soft ball when tested in very cold water. Remove from heat; add peppermint and marshmallow. Stir until dissolved. Add walnuts or pecans; stir until well coated. Pour onto waxed paper. Separate nuts whiles still warm. Makes about 1 1/4 pounds of minted walnuts or pecans.

Source: http://southernfood.about.com/od/candyrecipes