They needed some ghee for cooking the curry in.
Is it correct to use the preposition 'in'?
It depends on the details of the cooking method (which I am not familiar with). " On the other hand, if the ghee is mixed in with the curry as it cooks then you would probably not say cook "in".
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It depends on the details of the cooking method (which I am not familiar with). If the ghee surrounds or lies beneath the curry as it is cooking, like boiling carrots in water, or frying potatoes in fat, then "in" is probably OK, though I would prefer "They needed some ghee to cook the curry in." On the other hand, if the ghee is mixed in with the curry as it cooks then you would