1 1/2 c. unpopped corn
1 c. butter
2 c. firmly packed brown sugar
1/2 c. light corn syrup
1 tsp. salt
1 tsp. vanilla
1/3 tsp. baking soda

Pop the corn. Melt butter, brown sugar, corn syrup and salt. Bring to a boil, stirring constantly, then let boil 5 minutes without stirring. Remove from heat. Stir in baking soda and vanilla. Gradually pour over popcorn, mixing well. Turn into large roaster and bake in preheated 250°F oven for 1 hour, stirring every 15 minutes. Remove from oven and turn onto some heatproof surface to cool.