Place salmon in a large skillet. Add 1/2 cup wine and enough water to just cover the salmon. Bring to a boil over high heat. Reduce to a simmer, turn the salmon over, cover and cook for 5 minutes. Remove from the heat.

Meanwhile, heat oil in a medium skillet over medium-high heat. Add shallot and cook, stirring, until fragrant, about 30 seconds. Add the remaining 1/2 cup wine; boil until slightly reduced, about 1 minute. Stir in lemon juice and capers; cook 1 minute more. Remove from the heat; stir in sour cream and salt. To serve, top the salmon with the sauce and garnish with dill.

Tips Notes

Tip: How to skin a salmon fillet: Place skin-side down. Starting at the tail end, slip a long knife between the fish flesh and the skin, holding down firmly with your other hand. Gently push the blade along at a 30° angle, separating the fillet from the skin without cutting through either.