Spread popped corn and nuts on two greased cookie pans. Place sugar, butter and corn syrup in 3-qt. saucepan. Heat over medium heat until sugar is dissolved, stirring constantly. Boil about 10-15 mins., until the mixture turns light carmel color (or when candy thermometer registers 390 degrees, hard crack). Pour hot syrup evenly over popcorn and nuts on cookie sheets. After mixture is dry, break apart and store in tightly covered containers.