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10 cups popped popcorn
1 cup packed brown sugar
1/2 cup butter, cubed
1/4 cup dark corn syrup
1/4 teaspoon salt
1/4 teaspoon baking soda
1/2 cup mixed nuts
Place popcorn in a large bowl; set aside.
In a large heavy saucepan, combine brown sugar, butter, corn syrup and salt. Cook over medium heat, stirring occasionally, until mixture comes to a rolling boil. Cook and stir until candy thermometer reads 238° (soft-ball stage). Remove from heat; stir in baking soda (mixture will foam). Quickly pour over popcorn and mix well; stir in nuts.
Transfer to two greased 13x9-in. baking pans. Bake at 200° 45 minutes, stirring once. Remove from pans and place on waxed paper to cool. Break into clusters. Store in airtight containers.