NYT Cooking: Salmon, gently roasted to a buttery medium-rare, stars in this make-ahead-friendly dish. Fruity citrus and dill join spicy radishes and ginger, and the result is a refreshing, jostling mix of juicy, crunchy, creamy, spicy and sweet. Both the salad and the salmon can be made two days ahead, and everything is good at room temperature or cold. To embellish further, consider baby greens, thinly sli...