Created by LindasBusyKitchen on November 25, 2011
Step 1: Stir first 4 ingredients together in a heavy cast iron pan. Bring to a boil over medium heat, stirring every few minutes.
Step 2: Boil briskly until mixture forms a soft ball in a glass of cold water (238 degrees F using a candy thermometer). Boil about 20 minutes, if you don't have a thermometer.
Step 3: Take off stove. Stir in marshmallow, walnuts and vanilla. You can also add a heaping tablespoon of peanut butter too!
Step 4: Pour in well greased 9x13 inch pan, and let cool.
Step 5: Cut into 2 inch squares, and refrigerate, if desired.
Step 6: Store in airtight container.