Do you recognize these? They are often used in various Asian cuisines. Originating from Iran, saffron is the most expensive spice on the planet, and more expensive than gold by weight. It is extremely subtle, fragrant and slightly sweet. It's tricky to describe, but you know it when you taste it. Mint is perfect for pairing with meat, and its sauce is a classic match for roast lamb. People have very different views on cilantro. Some say it has a slight citrusy and sour taste, but others say it tastes like soap. Lemongrass originated from India and is an essential ingredient in Thai cooking. It's one of the main ingredients in Thailand's famous Tom Yum Soup.