1Grease bottom and sides of square baking dish, 8x8x2 or 9x9x2 inches, with butter.
2Heat all ingredients to boiling in heavy 3-quart saucepan over medium heat, stirring constantly. Cook about 35 minutes, stirring frequently, to 245°F on candy thermometer or until small amount of mixture dropped into cup of very cold water forms a firm ball that holds its shape until pressed. Immediately spread in baking dish. Cool completely, about 2 hours.
3Cut into 8 rows by 8 rows, using kitchen scissors or sharp knife. Wrap individually in waxed paper or plastic wrap. Store wrapped candies in airtight container at room temperature.