Strawberry Fudge

3 cups granulated sugar
4 tablespoons strawberry gelatin
1/8 teaspoon salt
3/4 cup milk
1/2 cup half-and-half
1 tablespoon white corn syrup
2 tablespoons butter or margarine
1 teaspoon vanilla extract
1/4 cup finely chopped pecans or walnuts

Combine first 6 ingredients in a buttered 3-quart heavy saucepan. Bring mixture to boil over medium heat, stirring constantly. Cook without stirring until candy thermometer reaches 230