Never Fail Peanut Brittle
["3 c. sugar", "1 1/8 c. white Karo", "1/2 c. water", "4 c. Spanish peanuts", "3 tsp. butter", "1 tsp. vanilla", "2 1/2 tsp. soda"]
["Boil sugar, Karo and water until thread spins or 250\u00b0.", "Add peanuts and cook until a few drops dropped in a cup of cold water cracks.", "Remove from heat.", "Add butter, vanilla and soda.", "Pour onto buttered cookie sheet, spreading as thin as possible with spoon."]
["sugar", "white Karo", "water", "Spanish peanuts", "butter", "vanilla", "soda"]