Yum Yum!!
Combine sugar, sour cream, milk, corn syrup, and salt in a heavy saucepan and bring to a boil, stirring constantly.
Then cover and cook 3 minutes without stirring.
Remove cover and continue to cook without stirring until mixture reads 234 degrees F on candy thermometer.
Pour into large mixing bowl.
Let cool.
Beat in butter and vanilla.
Continue beating until fudge loses glossy appearance.
Pour into 8x8-inch square buttered pan.
Cool, and cut into squares.
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