1. Step
Sprinkle salmon pieces with 1/4 teaspoon salt. Heat oil in a large nonstick skillet over medium-high heat. Add the salmon and cook until just opaque in the center, gently turning halfway, 4 to 7 minutes total. Divide among 4 plates. Remove the pan from the heat and immediately add lemon juice, butter, peppercorns and the remaining pinch of salt; swirl the pan carefully to incorporate the butter into the sauce. Top each portion of fish with sauce (about 2 teaspoons each).