Use a large open roaster, and fill with the popcorn. Bring sugar, 2 sticks of butter and corn syrup to a boil over med-high heat stirring constantly. Cook at a full rolling boil for 5 minutes. Start counting at full boil. Remove from heat and add the teaspoon of butter and the baking soda.Blend well and pour over popcorn, stir to coat. Bake@225 for 1 hour, stirring every 15 minutes , Cool and serve.