Butter 9 inch square pan; set aside. Combine sugar, cocoa, salt and corn syrup in heavy 3 quart saucepan; add evaporated milk and water. Cook over medium heat, stirring constantly, until mixture boils. Cook, stirring frequently, to 245 degrees (firm ball stage) or until syrup, when dropped into very cold water, forms a firm ball that does not flatten when removed from water. Remove from heat; stir in butter and vanilla, blending well. Pour into prepared pan. Cool; cut into 1 inch squares with buttered scissors. Wrap individually in plastic wrap or wax paper.
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