Peppery watercress and bitter endive are nicely offset with tart-sweet green apples. The rich, robust flavor of hazelnuts provides a nice accent in both the salad dressing and sprinkled on top.
Preheat the oven to 375°F. Spread the hazelnuts in a shallow metal pan, place in the oven, and toast, stirring once or twice, until crisp, fragrant, and brown, about 10 minutes