Recipe courtesy of Priscilla Martel

Rock Candy

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  • Level: Easy
  • Total: 10 min
  • Cook: 10 min
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1 1/2 cups granulated sugar

1 cup water

Sugar thermometer

1 8-inch square pan (Note: this pan will be ruined for anything else in the future.)

Butcher's twine


  1. Punch holes at the top edge of a thin 8-inch square pan so that you will be able to lace 7 strings from one side of the pan to the other. Place the laced pan in a pan deep enough to catch any leaking syrup.
  2. Dissolve 2 1/2 cups of sugar in 1 cup water and cook without stirring to the hard-ball stage, 247 degrees to 252 degrees. Pour the syrup into the laced pan. It should reach a level about 3/4-inch above the strings. Cover the surface with a piece of foil.
  3. Watch and wait. The syrup may take as long as a week to crystallize.
  4. Lift out the laced pan. Cut the strings and dislodge the rock candy. Rinse quickly under cold water and put on racks to dry in a very low-temperature oven.