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Heat the oil in a saucepan over a medium heat, then fry the garlic, chilli and rosemary for 2-3 mins. Remove from the heat, set aside and leave the oil to infuse for 30 mins.
Cook the popcorn according to pack instructions. Scoop the garlic out of the infused oil and discard. Toss the popcorn with the oil, then season and serve straightaway.