Macadamia Nut Butter Toffee

Bahan-bahan (24 porsi)

• 1 cup (2 sticks) unsalted butter
• 1 cup granulated white sugar
• 6 tablespoons light corn syrup
• ¼ teaspoon salt
• 1 cup chopped (toasted) macadamia nuts, (divided)
• 8 ounces chopped bittersweet or semisweet chocolate ((or use chocolate chips))