1 1/2 c. brown sugar
2/3 c. white Karo syrup
1/2 c. butter
1/4 tsp. salt

Mix. Cook over low heat and bring to a boil. Boil for 1 minute. Remove from the heat and beat for a few minutes. Add 1/4 teaspoon baking soda. Beat hard until well mixed. Pour over popped corn. This will be sticky, but should get hard.