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Place the split peas in a bowl, cover with cold water and leave to soak for several hours or overnight. Drain, rinse in cold water and drain again.
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Heat the oil in a saucepan. Add the onion, cover and cook until soft.
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Reserve a handful of the diced zucchini and add the rest to the pan.
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Cook, stirring constantly for 2-3 minutes. Add the split peas to the pan.
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Add the stock and turmeric to the pan and bring to a boil.
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Reduce heat and simmer for 30-40 minutes, or until the split peas are tender.
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Season with salt and pepper to taste.
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When the soup is almost ready, bring a saucepan of water to a boil, add the reserved zucchini and cook for 1 minute. Drain.
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Serve soup garnished with the boiled zucchini.