Grilling: Planked Whitefish with Cilantro-Lime Butter

INGREDIENTS

• 2 large or 4 medium fillets of a mild whitefish, such as haddock, flounder, or cod
• 1 teaspoon Kosher salt
• 1 teaspoon chili powder
• 1/2 teaspoon freshly ground black pepper
•  
• 8 tablespoons of butter, softened
• 2 tablespoon finely chopped fresh cilantro
• 1 medium serrano chile, seeded and finely minced
• 1 tablespoon lime juice
• Zest of 1 lime
• 2 cedar planks, soaked for 1 hour prior to use