Butter sides of heavy 2 qt pan. Combine sugar, corn syrup, butter and 1/2 cream. Bring to a boil LOW heat; stirring constantly. Slowly add remaining cream. Cook over low heat to medium ball stage, stirring almost constantly towards the end.
Remove from heat and stir in vanilla ( nuts if adding). Pour into a buttered 9x5 pan. Mark into squares when partially cool. Cut when cold. Wrap and store in airtight container.
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