With a center of “nuts, candies or prunes.”
From a box sold in Martinez, California.
Popcorn Ball Surprises
1/2 c. molasses
1 Tbsp. butter
1/8 tsp. soda
1/2 c. sugar
1/2 tsp. vinegar or lemon juice
2 quarts popped corn
Combine molasses, sugar and acid and boil until a little tried in cold water rattles against cup. Add soda and butter and pour into popped corn. Stir and when cool enough to handle, shape into balls with center of nuts, candies or prunes.
Yesterdish suggestion: I’m not sure how that rattling test is meant to work, but I am sure you should cook the syrup to 240 deg. F.