Halibut Salad with Citron Dressing

Japanese citron, or yuzu, adds a delightful flavor and aroma to many dishes in its native land. Here, the pure white, delicate flesh of poached halibut is beautifully paired with a yuzu-based dressing. The essence of this fruit’s peel is sold in small glass vials in many Oriental markets in the United States, and its unique flavor and aroma make it well worth the trouble of tracking this ingredient down. But if your best efforts at obtaining yuzu essence remain unreward