There are two kinds of poppy seeds sold on the spice markets, Black and White. They are imperfectly interchangeable due to color, taste and other characteristics. Both come from the infamous opium poppy, but contain only tiny amounts of the psychoactive alkalis morphine and codeine. Those have to be gathered from the sap long before the seeds are mature enough to harvest. Drug tests, however, may come out positive from eating poppy seed rolls, muffins or bagels. Poppy seed is also used as an oil seed, but in North America it's used for slow drying artist's oil paints rather than for cooking.
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In India, these used to be cheap and plentiful, so many older recipes call for a lot of them. Today, the poppy crop is tightly regulated and much smaller, so they are too expensive to use in traditional quantities.
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