Caramel Corn

7 quarts popped popcorn
2 cups brown sugar
1 cup butter
vanilla
1/2 cup corn syrup
1 tsp. salt
1/2 tsp. soda

Boil sugar, butter and corn syrup 4 minutes. Remove from stove and add salt, soda and vanilla. (This will foam when soda is added). Pour sauce over the popped popcorn, stir carefully. Put into a large pan into oven at 250F for 1 hour. Carefully stir every 10 minutes. If pan is big enough, shake popcorn--it doesn't crumble as much.

From the book "Treasured Mennonite Recipes"