Shallow-Poached Salmon

Fish is particularly good when poached; its fine flavor and texture are preserved in the gentle heat of the liquid. Submerged until done in hot, but not boiling, liquid, the flesh remains moist, tender, and light. Salmon, halibut, cod, sole, and trout are a few examples of fish that are well suited to poaching, whole or in steaks or fillets. Anything from plain salted water to a flavorful vegetable stock with wine (called a Court Bouillon; see page 335) can be used for the liquid. Because of its delicate flavors, poached fish is best served with a simple sauce such as a butter sauce, a mayonnaise, or a variation of salsa verde. Another way to poach fish, especially for a casual meal, is slightly different from the classic method of completely submerging the fish in the poaching liquid. I call it shallow poaching. There’s no special stock to make, the fish is in and out of the pan and onto the table in a matter of minutes, and a quick delicious sauce can be made from the liquid. Fill a low-sided heavy pan with an inch or two of water, or enough to come about halfway up the sides of the fish. Add a good splash of white wine (or a smaller one of wine vinegar); a sprig or two of parsley, fennel, or thyme—or a combination; and a large pinch of salt. Sometimes I float a slice or two of lemon in the water. Bring this to a boil and immediately turn it down to a barely perceptible simmer. Put in the fish, having seasoned it first with salt. Cook the fish for a few minutes on one side, carefully turn it over, and continue cooking until done. Be sure the water does not come back to a boil during the cooking. A thin fillet about 1/2 inch thick will cook in 5 to 7 minutes; a thick steak may take up to 12 minutes. Probe the fish to monitor the doneness. When done, remove the fish with a slotted spatula to a warm plate. To make a quick pan sauce, raise the heat and reduce the liquid by half. Have ready two generous pats of butter cut into small pieces. Whisk or swirl in the butter, bit by bit. Turn off the heat and remove the pan from the burner when the last bit of butter is added, and finish incorporating it off the heat. Taste the sauce and add, as needed, a squeeze of lemon or a pinch of salt or both. Pour the sauce over the warm fish and serve. Very thin fillets such as sole can be cooked in even less water, with butter already added. Pour 1/4 inch of water into a heavy pan, season with salt, and add a sprig or two of fresh herbs. Pour in a splash of wine or wine vinegar and about 2 tablespoons of butter. Put the pan over medium heat and when the liquid is just below a simmer, add the seasoned fillets and cover the pan. Cook until done, for 4 to 5 minutes, checking occasionally to monitor the heat. Remove the fish, raise the heat, and bring the sauce to a boil to thicken it. Taste and adjust the seasoning as needed. Pour the sauce over the fish and serve.