You probably know saffron as expensive red threads from Spain, sold in tiny, tiny containers at specialy stores and used to color and flavor paella. Its threads are picked from a type of crocus, the crocus sativus, and the painstaking nature of its harvest has led to it being known as "the world's most expensive spice." And, if you're anything like me, you may not have actually used it much; given that it's so pricey, saffron...

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