Gramma'S Peanut Brittle - cooking recipe

Ingredients

2 c. sugar
3/4 c. white Karo syrup
3/4 c. water
pinch of salt
1 1/2 tsp. butter
1/2 lb. uncooked peanuts
1 tsp. vanilla
1 heaping Tbsp. baking soda

Preparation

Must have a marble slab and candy thermometer.