Preheat oven to 200 degrees, and prepare two greased baking sheets
Mix the brown sugar, butter, molasses, and light corn syrup in a sauce pan. Bring to a rolling boil for 5 minutes.
Remove from heat and add the baking soda and cream of tarter.
Pour caramel mixture over the popcorn, and stir gently
Add popcorn onto prepared cookie sheets. Bake for 1 hour, carefully stirring halfway through
Keep in air tight containter