Step 1

Heat oil in a large nonstick skillet over medium-high heat until shimmering. Sprinkle salmon with 1/2 teaspoon pepper and 1/8 teaspoon salt. Add the salmon to the pan and cook until golden brown and flakes easily with a fork, 3 to 4 minutes per side. Transfer to a plate and break into large chunks.

Step 2

Whisk buttermilk, yogurt, cheese, lemon juice, Worcestershire, garlic, mustard and the remaining 1/2 teaspoon each pepper and salt in a large bowl until well blended. Reserve 1/4 cup of the dressing in a small bowl. Add lettuce, radicchio, basil and tarragon to the large bowl and toss to coat.

Step 3

Arrange the salad on a platter and top with the salmon. Serve topped with the reserved 1/4 cup dressing and more basil, if desired.