In a 3-quart saucepan, COMBINE sugar, syrup and water; COOK over medium-low heat, STIRRING constantly, until sugar dissolves.
COVER mixture; COOK over medium heat three minutes to wash down sugar crystals from sides of pan.
ADD peanuts; COOK until mixture reaches hard crack stage (300F), STIRRING occasionally.
REMOVE from heat; STIR in butter, vanilla, baking soda and salt.
Working quickly, POUR candy mixture into a buttered 15 X 10 X 1-inch jelly-roll pan; SPREAD to edges of pan.
Let COOL completely; BREAK into pieces.
Store in an airtight container.
Per Serving (excluding unknown items): 2790 Calories; 34g Fat (10.6% calories from fat); trace Protein; 652g Carbohydrate; 0g Dietary Fiber; 93mg Cholesterol; 2549mg Sodium. Exchanges: 7 Fat; 43 1/2 Other Carbohydrates.