In a heavy saucepan, put the sugar, water, syrup and salt. Boil until it spins a threat, approximately 290 degrees on the candy thermometer. Be sure not to have the heat too high or cook too long, as this causes the mixture to brown.
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Add the peanuts and cook to 300 degrees, stirring frequently. Remove from burner and add the butter, vanilla and baking soda. Pour out on a cold, buttered cookie sheet. Allow brittle to cool and break into pieces.
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