Nutty Caramel Corn

• 5 quarts popped popcorn
• 1 cup unsalted cashews
• 2 cups packed light-brown sugar
• 1/2 cup light corn syrup
• 1 cup (2 sticks) unsalted butter
• 1 tsp. salt
• 1/4 tsp. cream of tartar
• 1 tsp. baking soda

Heat oven to 200 degrees. Mix popped corn and cashews in roasting pan. In 3-quart saucepan, combine sugar, syrup, butter, salt, cream of tartar. Bring to boiling, stirring, over medium-high. Without stirring, boil until hard-ball stage, 260 degrees on candy thermometer, 6 to 8 minutes