Poached Salmon with Caper-Butter Sauce

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Ingredients

1. 2 tablespoons extra-virgin olive oil
2. 2 medium shallots, very finely chopped
3. 1 1/4 cups dry white wine
4. 1 stick cold unsalted butter, cut into tablespoons
5. 1 tablespoon capers, drained and rinsed
6. Salt and freshly ground pepper
7. 2 cups water
8. Four 6- to 7-ounce skinless salmon fillets
9. 2 cups shredded romaine lettuce

1. In a small skillet, heat the olive oil. Add the shallots and cook over low heat until softened, about 4 minutes. Add 3/4 cup of the wine and boil over high heat until reduced to 2 tablespoons, about 7 minutes. Reduce the heat to moderate. Remove the skillet from the heat and whisk in the butter, 1 tablespoon at a time, occasionally moving the pan back to the burner to keep the sauce very warm. Stir in the capers and season with salt and pepper.
2. In a large skillet, combine the water with the remaining 1/2 cup of wine and bring to a boil. Season the salmon fillets with salt and pepper and add them to the skillet. Simmer very gently over low heat, turning once, until just cooked through, about 4 minutes per side.
3. When the salmon is almost done, gently reheat the butter sauce over moderate heat, whisking constantly just until hot; do not let it boil. Spread the shredded lettuce on plates. Using a slotted spatula, remove the salmon fillets from the skillet and quickly pat them dry with a paper towel, then set them on the lettuce. Pour the caper-butter sauce over the salmon fillets and serve.