Melt butter and sugar. Add salt and corn syrup. Slowly add milk. Heat to 245 degrees F (or hard ball stage). Remove from heat and add vanilla. Pour into greased 9x9 inch pan. Cut into squares when cool and wrap each piece in plastic wrap.
Hard ball stage is when you can put a drop of the boiling mixture into a cup/glass of ice water and the boiled mixture will form a hard ball. It's much easier if you just buy a candy thermometer and check the temp.
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