Preheat oven to 325° F. Spread shelled walnuts in single layer on baking sheet. Bake nuts for 15-20 minutes, shaking every 5-10 minutes. Remove from oven. Combine sugar, cayenne and salt in a small bowl. Heat oil in skillet over medium heat. Add nuts and stir 1-2 minutes until warm. Remove from heat; sprinkle with seasoning mix and toss to coat evenly. Spread nuts on paper towel to cool.