What is the main spice in thai food?

There isn't one single "main" spice in Thai food. Thai cuisine is known for its complex and balanced flavor profiles, achieved through a combination of spices, herbs, and aromatics.

However, some key spices that are commonly used and contribute significantly to the characteristic Thai flavor include:

* Chilies: These provide heat and can range from mild to extremely hot, depending on the variety.

* Lemongrass: Aromatic, slightly citrusy, and adds a refreshing element.

* Galangal: Related to ginger, it has a pungent and slightly camphoraceous flavor.

* Kaffir lime leaves: Their distinct citrus aroma adds complexity and freshness.

* Turmeric: Adds a warm, earthy flavor and vibrant yellow color.

* Coriander: Both the seeds and the leaves are used for their earthy and slightly citrusy flavor.

* Thai basil: A sweet and slightly peppery flavor, often used in stir-fries and curries.

* Fish sauce: A fermented fish sauce that adds a salty, savory umami flavor.

It's important to note that the specific spice blend varies greatly depending on the region, the dish, and the chef's preference. Thai cuisine is a beautiful tapestry of diverse flavors, and its complexity comes from the skillful combination of these and other spices.