À la nage—the French method for poaching fish in a delicate broth—is gentle and mostly hands-off, and it delivers pristine flavor with restaurant-caliber panache. Our easy, elegant poached halibut is inspired by the classic French preparation called “la nage” in which fish is delicately cooked and served in well-seasoned, lightly acidulated broth. For a Southeast Asian–inspired riff, we infused mellow, lightly sweet coconut water with smashed lemongrass, ginger, and scallion, and added…
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