Place popped popcorn in large microwaveable bowl. In a 2-1/2 qt. bowl, combine brown sugar, margarine, syrup and salt. Bring to a boil on full power. Boil 3 minutes, stirring several times.
Remove from microwave and stir in soda. Mix well and pour foamy syrup over popcorn. Stir to coat. Return to microwave and cook on full power for 3-3 1/2 minutes, stirring every 30 seconds. This frequent stirring coats popcorn evenly.
Pour into jellyroll pan to cool. As the caramel corn cools it becomes quite crisp. Break apart into serving pieces. Store in airtight container.
By Robin from Washington, IA
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