Pour popcorn kernels into a brown paper lunch bag, fold over edge and tape with masking tape. Microwave on high for approximately 2 minutes.
Pour into a large glass bowl.
Preheat oven to 130oC.
Line a baking tray with baking paper.
In a medium saucepan, add in the ale, sugar, corn syrup and butter.
Bring to a simmer and allow to cook until it reaches hard crack stage (300° F–310° F).
Turn off heat, stir in pumpkin pie spice, and pour over the popcorn.
Stir well, pour onto baking tray and place in oven.
Bake for 40 minutes then set aside to cool.