Bring to boil the sugar, syrup, butter salt and cream of tartar. Boil to 250^, then stir in jello; cook 1 minute more to 260^. Remove from heat. Stir in baking soda( mixture will foam up- it is suppose to) mix down. Pour over popped corn With buttered hands form into small balls do not compress solid- or press into buttered jelly-roll pan and press down slightly. When cool break into pieces.
Note: Cooked crumbled bacon,nuts or coconut can be added after poured into buttered pan then press down slightly before it sets.