Butter an 8 x 8-inch square pan or line pan with buttered foil; set aside.
Combine sugar, cream, corn syrup, salt and butter in a heavy 3-quart saucepan. Cook over medium heat, stirring frequently until mixture boils. Continue cooking, stirring occasionally until candy thermometer reaches 235 to 240°F (soft ball stage). Remove from heat; do not remove candy thermometer.
Cool mixture to 100°F. (TIP: To speed cooling, place pan of hot fudge mixture in a cold water bath.) Remove candy thermometer.
Add vanilla. Beat mixture with a wooden spoon until it thickens and begins to lose its gloss (about 4 to 5 minutes). Stir in walnuts.
Pour fudge mixture into prepared pan. Cool completely. When firm, remove from pan; cut into squares.
About Corn Syrup
See why there’s no substituting Karo® Corn Syrups for treats with a delicate sweetness and smooth texture
Butter an 8 x 8-inch square pan or line pan with buttered foil; set aside.
Combine sugar, cream, corn syrup, salt and butter in a heavy 3-quart saucepan. Cook over medium heat, stirring frequently until mixture boils. Continue cooking, stirring occasionally until candy thermometer reaches 235 to 240°F (soft ball stage). Remove from heat; do not remove candy thermometer.
Cool mixture to 100°F. (TIP: To speed cooling, place pan of hot fudge mixture in a cold water bath.) Remove candy thermometer.
Add vanilla. Beat mixture with a wooden spoon until it thickens and begins to lose its gloss (about 4 to 5 minutes). Stir in walnuts.
Pour fudge mixture into prepared pan. Cool completely. When firm, remove from pan; cut into squares.