[Answer] 1. Which of these substances has long been considered the world's most expensive spice?

Step 1 : Introduction to the question "1. Which of these substances has long been considered the world's most expensive spice?"

...1. Rosemary 2. Thyme 3. Saffron 4. Basil Saffron is derived from the saffron crocus, and is native to southern Asia. This spice has a bitter flavor and has been used in Asian cooking for centuries. Crocin is a yellow dye that comes from saffron and is sometimes used to color pottery. In America, one of the most popular ways to eat saffron is to eat yellow rice. Saffron was selling in November of 2010 for 149.95 an ounce from "The Spice House" an online spice outlet.

Step 2 : Answer to the question "1. Which of these substances has long been considered the world's most expensive spice?"

Saffron:

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