• 21.5oz sugar
  • 4 ounces unsweetened chocolate
  • 3 tablespoons butter, plus more for greasing pan
  • 8.5oz half-and-half
  • 21g tablespoon corn syrup
  • 1 tablespoon vanilla extract
  1. Grease an 8 by 8-inch pan with butter. 
  2.  In a heavy-bottomed saucepan, combine the sugar, chocolate, 1 1/2 tablespoons of the butter, half-and-half, and corn syrup.
  3. Over medium heat, stir with a wooden spoon until sugar is dissolved and chocolate is melted.
  4. Increase heat and bring to a boil. Reduce heat to medium-low, cover, and boil for 3 minutes. 
  5. Remove the cover and attach a candy thermometer to the pot. Cook until the thermometer reads 234 degrees F. 
  6.  Remove from the heat and add the remaining butter. Do not stir. Let the mixture cool until it drops to 130 degrees F. 
  7.  Let sit in cool dry area until firm. Cut into 1-inch pieces and store in an airtight container for up to a week.