Radicchio and Apple Salad With Mustardy Croutons

Colorful, robust radicchio brings a touch of drama wherever it goes. In this hearty salad, the bitter chicory gets tamed by sweet, crisp apples and deeply roasted leeks. To keep the apples from oxidizing, they’re tossed in a bit of apple cider vinegar, which also reinforces their flavor and injects some welcome acid. Creamy, garlicky yogurt is punched up with mustard to make a dressing that adds a perfect, cooling finish.