This Radicchio & Spinach Salad is a refreshing and vibrant dish that combines the bitterness of radicchio with the freshness of spinach. The salad is dressed with a simple vinaigrette made with olive oil, lemon juice, Dijon mustard, and honey, which balances out the flavors and adds a touch of sweetness. Topped with toasted walnuts and crumbled feta cheese, this salad is a perfect side dish or light lunch option.