Halibut with Cranberry-Lime Chutney

Ingredients:

• 2/3 cup sugar
• 2 teaspoons lime zest, divided
• 2 tablespoons fresh lime juice
• 1 1/4 teaspoons kosher salt, divided
• 1 (8-ounce) package fresh cranberries
• 8 (6-ounce) halibut fillets
• 1 teaspoon freshly ground black pepper
• 6 tablespoons unsalted butter

Source