Microwave Caramel Popcorn

Pop popcorn until you have 5-6 quarts (20-24 cups).
Put in brown paper grocery bag
Mix in large glass bowl:
1 Cup Brown Sugar
1 Square Margarine
¼ tsp Salt
¼ Cup Karo Syrup

Heat mixture in microwave on high for 1 ½ minutes.
Remove and stir.
Put back in the microwave for 2 minutes.
Remove, ad ½ tsp baking soda, stir well.
Pour over popped popcorn in paper bag and stir or shake.
Roll top of paper bag and put in microwave for 30 seconds.
Remove and shake to further distribute caramel.
Shake popcorn onto cookie sheet lined with wax paper.