Grease a large cookie sheet and set aside for later.
In a saucepan over medium heat, bring sugar, corn syrup, salt and water to a boil. Stir until sugar is dissolved.
Stir in peanuts.
Set a candy thermometer in place and continue cooking. Stir frequently until the temp reaches 300 degrees F.
Once temp hits 300 F, remove from heat and immediately stir in butter and baking soda.
Immediately pour onto cookie sheet and help spread out a bit.
Let cool and then lift up mixture and snap into pieces.