Preheat the oven to 400°F (200°C). Line a rimmed baking sheet with parchment paper.
Arrange the salmon fillets skin-side down on the prepared sheet. Brush the tops with 1 tablespoon olive oil and season generously with salt and black pepper.
Roast the salmon in the preheated oven for about 12 minutes, until just cooked through and flaky when tested with a fork.
While the salmon roasts, combine 3/4 cup sour cream, 1/4 cup milk, 1 tablespoon chopped fresh dill, 1 1/2 tablespoons prepared horseradish, 2 tablespoons pink peppercorns, 1/2 teaspoon honey, and 1/2 teaspoon salt in a blender or food processor and puree until smooth.
Taste the sauce and adjust seasoning if needed. If desired, reserve a few whole pink peppercorns for sprinkling.
Serve the roasted salmon warm with a generous drizzle of the pink peppercorn sauce and a sprinkling of extra pink peppercorns.