Pesto

• 1 cup fresh basil leaves
• 1/2 cup fresh tarragon leaves
• 1/2 cup fresh dill leaves
• 1/2 cup chopped fresh chives
• 3 scallions, trimmed, white and green parts chopped
• 1 tablespoon fresh thyme leaves
• 1 tablespoon grated fresh horseradish or 2 teaspoons prepared horseradish
• 1 garlic clove, chopped
• Zest of 1 lemon
• 1/4 cup extra-virgin olive oil

Pork

• 1 (3-pound) pork loin roast
• 2 1/2 teaspoons kosher salt, divided
• 6 slices prosciutto
• 1/2 cup grated Parmesan cheese
• 2 teaspoons ground black pepper
• 2 tablespoons olive oil