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Preheat your oven to around 220 °C.
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Spread green beans evenly over a roasting tray. Make sure that the beans are in a single layer.
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Place the tray in the preheated oven (do NOT put them in a cold oven).
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When the beans start turning yellow, mix the beans moving those on the outside to the inside and vice versa - spreading them out again. Make sure your extractor fan is on - there will likely be a fair amount of smoke - more as the roast gets darker.
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Watch carefully and at first crack turn the beans again (as per previous step). As the beans complete first crack, turn them again.
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At this point, do not leave the beans. The darker the roast, the more risk of them igniting.
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Take the beans out of the oven when they've reached the desired roast. Take them outside to cool them, blowing away the chaff as you agitate them. There may be some chaff in the oven which should be vacuumed out when the oven has cooled.