In a medium to large cast iron pot with a lid (Dutch oven), pour in the oil (it should cover the bottom of the pot). Add 2 popcorn kernels, then put the lid on the pot and place the pot on medium to high heat.
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Listen for the two kernels to pop, then immediately add in the rest of the kernels; they should cover the bottom of the pot in a single layer. Replace the lid again and listen for when popping to start again.
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Sprinkle salt and pepper over the popcorn and use a fine grater or a microplane to grate the lemon zest. Toss the popcorn to make sure all the flavorings are distributed, then serve in a bowl.
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