Combine sugar, syrup, and half-and-half in a 3-quart saucepan. Bring to a boil, stirring until sugar dissolves. Cook over medium heat, stirring occasionally, until mixture reaches soft ball stage (238°).
Remove from heat; beat at medium speed of an electric mixer 8 minutes or until mixture thickens. Stir in vanilla, candied fruit, and nuts. With buttered hands, divide mixture into 7 equal portions. Shape each portion into an 8-inch log. Wrap each log in waxed paper; chill thoroughly. Remove waxed paper, and cut each log into 1/4-inch-thick slices. Store in airtight containers in refrigerator.